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Density:Ocean Currents

By Janice VanCleave

Two red balls appear to be the same, but are they?

Density is a ratio of  mass to volume. Relative density is a comparison of the density of two or more things.For example: What is the relative density of the two balls and water in the diagram? Ball A sinks in the water, thus the density of ball A is greater than the density of water. […]

Filed Under: Physics Tagged With: density, mass, mixture, ocean currents, ocean water, polar ocean currents, relative density, relative density of liquids, salt concentration, volume

Hidden Colors

By Janice VanCleave

Paper Chromatography Chromatography means to write with colors. Chromatography is a chemical process of separating mixtures of colorants. The first video below demonstrates the following Paper Chromatography procedure steps. The video also has a craft idea for making a butterfly using the colored paper filter.The second video below provides information about paper chromatography as well as more […]

Filed Under: Chemistry Tagged With: chromatography, colorants, mixture

Stone Soup Activity

By Janice VanCleave

Stone Soup is a wonderful story to encourage kids to share with each other. The video is one version of the story “Stone Soup.” Another tells of a solder who set up a cooking pot outdoors. He added water and a stone to the pot and started a fire beneath the pot. Periodically he would […]

Filed Under: Chemistry Tagged With: mixture

How to Make Perfume

By Janice VanCleave

Question: How can I make perfume? Answer: We often use the word perfume in a generic way, meaning any liquid applied to the body to give it a pleasant fragrance. But perfume (parfume) –what I call “Real” perfume is more concentrated and is generally more expensive than a cologne with the same fragrance. Another way […]

Filed Under: Chemistry Tagged With: mixture, perfume, soluble, solution

Perfume Notes

By Janice VanCleave

Question: Why do perfumes smell different? Answer: Perfume is a generic term used for liquids with a distinctive pleasant smell. A more scientific definition is that perfume is a liquid solution, which is a mixture of a liquid solvent and different solutes. The liquid solvent for perfumes is generally ethanol (alcohol) or a mixture of […]

Filed Under: Biology Tagged With: mixture, sense notes, solute, solution, solvent

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Welcome to Janice’s Science Extravaganza!

The spoon hanging from the string vibrates when struck and these vibrations are transmitted through the string and the sound is amplified by the plastic cups. ABOUT ME: Hi, I am Janice VanCleave, author of 50 best-selling science experiment books for children ages 4 through high school. I taught science for 27 years. MORE.....

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