Thursday, September 29, 2011

Cohesion and adhesion - Two activities for primary school teachers

!±8± Cohesion and adhesion - Two activities for primary school teachers

Here are two simple activities to show students the basic concepts of cohesion and adhesion.

COHESION

"Niagara Falls"

MATERIALS

A Penny
Pipette
Detergent

PROCEDURE

Ask: "How many drops of water you think you can drop a dime on this site without it over the edge?" Put the pot cent on a smooth surface. Pipette with the drops of liquid onto a dime down at a time, counting the drops until the oil spillEdge.

Take the same coin, and rub a solvent.

Predicting the number of drops of water that you can put on the dime now, without it pouring over the edge.

With the pipette, the liquid drips down to the penny drops and counting.

STATEMENT

Water molecules have a strong cohesion, or attraction to other water molecules. The unifying force of the molecules is like the skin as a liquid surface, called surface tension. Soap reduces the surface tension, soto stay a few drops on the penny with soap.

MEMBERSHIP

"PASS THE PEPPER"

MATERIALS

Cereal Bowl
Pepper
Liquid detergent for dishwashers

PROCEDURE

Fill bowl with water and brush a little pepper on top.

Ask: "What do you think will happen to the pepper, if we add Detergent?"

Drop a few drops of detergent to the center of the bowl.

STATEMENT

Adhesion is the attractive force that holds together the molecular ANDERS bodies in contact. TheWater is hands pepper evenly from all directions. The detergent reduces the adhesive force between the liquid and pepper. The fluid around the edges of the basin, influenced by the detergent industry, still has its pulling power.


Cohesion and adhesion - Two activities for primary school teachers

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Sunday, September 25, 2011

The properties of water

!±8± The properties of water

The water available in a variety of forms. First, commonly known as a liquid, secondly, as a solid form of ice, and thirdly as a gas-steam. But in addition to the standard forms that water takes, it also has amazing properties as well. These properties are usually referred to as anomalous properties. Some of these anomalous properties belong to different noise levels at different temperatures and surface tension.

Volume of water at different temperatures

Have you ever wondered whyLines, freeze water when the outbreak, or why ice floats in a river instead of falling? It 'easy, due to the fact that the volume of water varies depending on the temperature. For example, the volume of water by about 9% increase in the freezing point. As the water molecules become even colder, to go further. Therefore, the water in the pipes can burst, as well as why ice floats on liquid. At the other end of the spectrum, the molecules of water should boil90 degrees Celsius, but because of the hydrogen bonds in the molecule, water boils at a higher temperature-100 degrees Celsius, to be exact.

Surface tension

Surface tension is another anomalous properties of water. It can be shown easily if an insect falls into a pond or pool. Water can be a very closed and elastic substance. This is due to the fact that water molecules are more attracted to other water molecules next to him. It should be noted however, thatThe surface tension is only present on the surface of the reason that the water beneath the surface of the pool or pond is low. Load zero means that no net force on the molecule, but water works only on the surface with different forces laterally and downwards. This is what creates a membrane tension and surface tension.

Pure Water

Pure water is not so clear, in fact it is almost impossible to create with only pure water molecules of H2O.In all cases, the pure water usually means that it is distilled or deionized, but there are still many gases dissolved silica and sometimes even within the molecules.

Drinking water

In contrast to pure water, our drinking water is usually full of many different substances, including feelings such as calcium, magnesium, iron, and even atmospheric gases. It should be noted that drinking water can be positive or negative charge, but these ions are usually symmetricalfrom the negative ion carbonate / bicarbonate, chloride and sulfate, and occasionally.

Because the water can easily dissolve most substances, if you're in an area where the water comes into contact with live toxic agents, this can affect your water to a certain extent. The EPA (Environmental Protection Agency) has limits on the amount of contaminants in drinking water and drinking water is a test of regular permits.

If you believe that the only way toAvoid contamination by potentially harmful substances is water directly from rain or snow, you should know that these forms of water pollution can also be drunk mainly due to dust particles in contact with the water in the atmosphere.


The properties of water

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Thursday, September 15, 2011

Water for Life

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Monday, September 12, 2011

Silicone non-stick coatings - Better Than Teflon? Or just a disaster!

!±8± Silicone non-stick coatings - Better Than Teflon? Or just a disaster!

Think of non-stick coating with silicone? But then the thought "not permanent", rambling, chaotic connections also come to mind?

Well, it's certainly understandable. After all, the silicone can be used as an agent of the temporary posting in measurable quantities, to transfer the released area. Not unlike soaps, oils - hydrofluorocarbons either! Their effectiveness, you see, is formed by weak boundaries between the two surfaces. The result: surface contamination!

But should notin this way. There are new formulations of silicone abound. Many, in fact, totally lacking in surface migratory species.

Polydimethylsiloxane (PDMS for short) are a good example. Low surface energy comes from the surface into the air dimethyl. (A concrete measure of this is the surface tension, about 20-22 dyn / cm.) Coupled makes it highly flexible, barrier-free polymer chain or backbone (Si-O-Si bonds) as opposed to Teflon coatings, release silicone unbeatable.

But for Siliconare non-migratory, the film must be consistent. And that includes choosing products that are curable, are treatable.

Today, silicone coatings are often integrated with a resin filling. This leads to a higher density, more cohesive force. Imagine a phenomenon of "stretching" to the plug interface. Here, the silicon compounds are now more rigid, relatively inelastic surfaces with a better energy absorption capacity.

Translation: A non-migratory, with a covering sustainable, highRelease.

For applications, the release of pressure sensitive adhesives, these newer formulations of silicone are ideal. So, take note designers and manufacturers of equipment for the packaging!

Today, more personalized painter these products one step ahead. By "external" forms of reinforcement, such as plasma spray, its resistance to abrasion - a term that completely unusual silicon - became a reality.

So, yes, continue to develop non-stick silicone coating, anddevelopment.


Silicone non-stick coatings - Better Than Teflon? Or just a disaster!

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Friday, September 9, 2011

Your Ink Glossary are just created to hold the cartridges

!±8± Your Ink Glossary are just created to hold the cartridges

If you need help with ink and words are in this section will help you. The following glossary is intended to help capture the most important concepts that control the art and science of ink consumption.

Absorption:

Othe proliferation and the reduction of transmission of visible light in its interaction with matter, which is in change of its color.

Appearance:

Othe nature of objects as visual attributes such as size, shape, color, texture, gloss, transparency andOpacity.

Attribute:

oColors are often described by their attributes of hue, saturation or chroma and brightness.

Banding:

oDistinct pattern changes, rather than a transition of colors in a gradient or other effects. Occurs in half-tone images when viewed with less than 24 bits of digital information, or without sufficient information on the color gradient of pressure.

Black:

Othe absence of reflected light, the color of the product when aBody absorbs all wavelengths of light. As a 100% cyan, magenta and yellow are combined, the resulting color should be black, but actually produces a muddy gray or brown. Therefore, in full color, black is one of the inks. The letter "K" is used to represent Black in the CMYK acronym to differentiate it from "B" for blue in RGB.

Brightness:

Othe measure the reflective quality of a medium. Different levels of brightness can changeappearance of color in the media require adjustments in calibration to obtain an optimal result.

Calibration:

oChecking, furniture and systematically standardizing the accounts of a unit.

Chroma:

OIN visual perception, if an area shows a specific color or color saturation. For example, a red apple is high in chroma; pastel colors are low. Black, white and gray have no saturation. Part of the color model L * C * H or the brightness, intensity, color hue. In addition, undersaturation.

ICE:

oCommission International de l'Eclairage or International Commission on Illumination, the key institution that deals with the overall color and color measurement.

CMY:

Othe subtractive primary colors cyan, magenta and yellow.
Color Calibration:

oCoordination color matching between two or more digital devices through hardware or software.

Color Curves:

oVisual mechanism in photos and graphics software for color displayMeasures and make changes of tone in an image.

Color separation:

oPhotographic or electronic procedure for the preparation of such tables for each component of a color space. In print, for example, the separation of cyan, magenta, yellow and black components on a page image.

Color Wheel:

OAN available in the visible spectrum is a continuum of colors in a circular fashion, that the complementary colors, like red and green faces everyothers.

Dyes:

oMaterials used to create colors, such as dyes, pigments, toners, phosphors.

Colorimeter:

oDevice which measures the color values ​​in relation to a particular set of standards, such as the CIE. Allows the measurement of color differences more accurately than the human eye.

Cyan:

Othe color "redless" process. It takes all the red wavelengths and reflects all wavelengths of blue and green light.

Delta-E:

ounite measurea noticeable difference in color by the human eye.

Densitometer:

oDevice be used to measure the density of light through the absorption of a substrate or surface of paper or film. This is done either by reflection or transmission.

Density:

Othe ability of a material to absorb light. The dark material, the higher the density.

Digital Photo Printer:

oPrinting device that converts digital data printed on paper.

Dithering

oA processsimulates the variations in color or gray scale because of different sizes and shapes of groups of pixels instead of an ordered series of points. This reduces the contrast between the dots in different colors or shades, and provides a smooth, natural appearance.

Dot Gain:

Othe effect described single point of larger print on a grid or other models such as its proposed size, which is a darkening of the image.

Dots per inch (dpi):

oMeasurementThe resolution of the image file described by measuring the number of pixels displayed horizontally or vertically in a separate square inch.

Dye:

oColored chemical that dissolves completely in water or other solvents, such as pigments, which are insoluble, however.

Sublimation:

oColor pressure generated images with the help of dyes from a gaseous thermal printer driver.
Improved Color Range:

Or exactly when diluted color process,cyan and magenta are usually used with CMYK to produce more vivid colors and a halftone effect.

Expanded range of colors:

OR If additional colors, usually green and orange, are printed with CMYK to match produced a greater number of colors in CMYK.

Fluorescent:

oA with a glass tube filled with mercury gas and the inner surface is coated with phosphors. Once the gas is charged with electricity, radiation is produced, which triggers the 'Phosphors and make them shine.

Color:

oPrinting or imaging using combinations of subtractive primary colors cyan, magenta, yellow and black. These are deposited as dots of different sizes, shapes and angles to create the illusion of different colors.

Gamut:

Othe palette of colors that are interpreted by a color model or generated by a specific device.

Gamut Compression:

oAlso known as tonal range compression. The coordinates of aColor space with more bandwidth can be reduced to correspond with the range smaller than a destination color space. For example, the full range of photographic film for viewing in the CMYK color space into smaller four-color printing is compressed.

Alcohol:

Othe transition between two colors or between black and any color mixing percentages of dominant and secondary color correction, and then alternately drawn to achieve the desired effect.

Halftone:

Othe processThe reproduction of an image as a series of dots of varying size within a fixed grid.

Hexachrome:

oColor-matching system of Pantone, Inc., used with hi-fi and color devices.

Hi-Fi Color:

oPrinting process that expands the capabilities of printing more sound through the use of stochastic screening, six-color printing and other techniques to expand the possible space of the traditional skills of the four color process colors.

Tone:

Othe base coloras an object from its angular position in a cylindrical color space is defined, or a color wheel.

Inkjet:

oPrinting driven process where liquid ink onto a substrate such as paper or film to form characters and graphics. There are three types of inkjet printers: thermal variation, piezoelectric and phase.

Intensity:

oSaturation or reflect light, in terms of wavelengths of visible light. The reflection wavelengths of high intensity generates high saturationor chroma.

Light:

oElectromagnetic radiation in the spectral range of the human eye (about 380-720 nm) is detected.

Light Magenta / Light Magenta (LM-LC):

oMuted or diluted forms of the two primary colors. When added to these shades of CMYK to produce more variety of colors and natural tones dot print.

Brightness:

Othe attribute causes an area emit or reflect more or less light. It also refers to the perception that white objectsdistinguished from gray, and light from dark objects.

Luminance:

oDescribes the brightness of an image.

Magenta:

Othe color "Greenless" process. It absorbs all wavelengths of light green, while all the red and blue wavelengths.

Nano-meters (Nm):

Othe measurement of wavelengths. Unit of length equal to 109 meters or one millionth of a millimeter.

Opacity:

oDescribes the resistance of the light through a substrate.

PantoneMatching System (PMS):

oUnique numbering system to identify colors by combining color SWOP standard created.

PH:

oA value of acidity or alkalinity of a solution expressed.

Phase Change Inkjet:

oInkjet printing process uses the dissolution of solid ink and then connect the droplets of spray to the media.

Piezo Inkjet:

oInkjet printing process used in the electrical impulses from the piezoelectric crystal with the power to inspire and ink-jet inkNozzles on substrates.

Pigment:

oColorant that can not be dissolved in a liquid. Full color, sharper and darker for a broader range of plain paper.

Pixels:

picture element or small, red, green and blue color reproduction on a monitor or scanner contains. Pixels on a screen similar to the dots on the paper. Monitor resolution is measured in pixels per inch (ppi) has described as the print resolution is measured in dots per inch (dpi).

Pixelper inch (ppi):

Othe number of pixels in an image that Rastar stand in line an inch long. The higher the pixels, the higher the resolution.
Primary Color:

oColors that are fundamental for the other colors. In the background of the primary colors red, green and blue (RGB) are. In the color photo printing are cyan, magenta and yellow (CMY). Black or key (K) is to produce over one quarter of CMY ink pressure to tight, real blacks and clearer, sharper images.

Print onQuestion:

Oterma for a variety of short-term processes of publishing, technology, copier and direct-to-print applications include.

Prism:

oTriangular-shaped glass or other transparent material through which, when the light is out, breaking the wavelengths in a rainbow of colors. A test that light colors indicating the arrangement of colors and made in the visible spectrum.

Process Color:

oCyan, magenta, yellow and black combine to create a newColor.

Raster Image Processor (RIP):

oSoftware and / or hardware are used for digital printing request information to a printer or other device to convert the final output to produce. This action is commonly referred to as "ripping" (a file).

Reflective:

Othe capacity of an area to recover some or all wavelengths of light that hits it.

Resolution:

Othe number of points or samples per inch that a device is able to identify, produce or will.

RGB:

Otheadditive primary colors: red, green and blue.

Saturation:

oColor attribute that expresses the degree of deviation from the neutral gray of the same brightness. Also called chroma.

Sequence:

Othe sequence are deposited in the painting through a printing unit. In CMYK inkjet printers is the sequence of yellow, magenta, cyan and black.

Spectral curve:

oA visual representation of a given spectral color as the color of the "fingerprint". A spectral curve is plotted on a grid composeda vertical axis describes the level of intensity of reflection and a horizontal axis, the spectrum of visible wavelengths. The percentage of light reflected at each interval is as points on a curve.

Spectral data:

Othe more accurate description of the color of an object. Since the results from the light color of an object appearance is changed by it, and reflects the viewer, which describes the spectral data, such as reflected light has changed. The percentage of reflected light ismeasured at different intervals over the entire range of wavelengths, which then represented visually as a spectral curve.

Spectrophotometer:

OAN tool or the properties of light reflected from or passing through an object of measures.

Spectrum:

Othe spatial arrangement of electromagnetic energy on the size of the wavelength.

Spooler:

Othe room, which is held in the print data in a computer memory or hard drive, while waitinga print device.

Specifications for Web Offset Printing (SWOP):

oFormulations used in printing inks in offset printing.

Standard:

OAN-established and recognized tool are evaluated according to its measurement.

Subtractive Primary Color:

, OCyan magenta and yellow. The combination of the three theoretical 100% should produce a white paper on black. The combination produces a range of different intensities of color. The combination of two primary,100% creates both the colors red, green and blue additive primaries.

Cyan + magenta = blue. Cyan + Yellow = Green. Magenta + yellow = red

Surface tension:

Othe cohesive forces on the surface of a liquid, which reduce the tendency of a liquid, the surface exposed to a minimum to promote the area. Molecules in a liquid are attracted equally from all sides, but near the surface experience unequal attractions and thus are drawn toward the center of the liquid mass by this networkForce.

Thermal drop-on-Demand:

oInkjet printing process color that can be heated in a larger room of the print head at a temperature than its boiling point. The heat expands and changes the properties of ink, which is then distributed through the head on the substrate.

Tolerance:

Othe acceptable difference between the known standard correctly, and a number of samples measured. See Delta Error.

Viscosity:

other internal resistance to flow through an exhibitionLiquid.

Visible spectrum:

Othe in the region of the electromagnetic spectrum, 380-720 nanometers. To produce wavelengths within this range as the human eye color seen. Wavelengths produce violet, purple and blue, while the result in longer wavelengths of red and orange.

Wavelength:

oMeasurement of light as a component of the electromagnetic waves. The wavelength is the peak to peak distance between two adjacent waves.

Yellow:

Yellow is the OpurColor "Blueless". It absorbs all wavelengths of blue light and reflects all red and green wavelengths.

These brief definitions of words inkjet ink is using certain words in the vocabulary, to help resolve the plateau of ink.


Your Ink Glossary are just created to hold the cartridges

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