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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

States of Matter

By Janice VanCleave

The waterfall fills a pool and when the pool fills the water spills over the top, thus water takes up space.

What is Matter? Matter is anything that has mass and takes up space, such as water. The photo shows water first falling and filling and collecting at the bottom of the waterfall. When the collected water increases in volume, the water spills over a rock boundary. Water takes up space. Volume is the amount of […]

Filed Under: Chemistry Tagged With: cohesion, gas, heat, inertia, liquid, mass, matter, solid, volume

Archimedes: I.D.s Gold

By Janice VanCleave

Art from Aryaman's website https://aryamanpanda.wordpress.com/2015/09/20/density-and-buoyancy/

Before the Greek mathematician and inventor Archimedes (C.287-212 B.C.), nobody knew why some things float and others don’t. It is said that Archimedes’ king gave a silversmith a certain amount of gold to make him a new crown. When the crown was finished, the king asked Archimedes to figure out a way to secretly decide […]

Filed Under: Physics Tagged With: Archimedes, buoyancy, density, displacement, volume

Gases Have Volume

By Janice VanCleave

Chemistry is the study of the composition, structure, properties, and interactions of matter. Matter is all the material in the universe. Simply, matter is the stuff that things are made up of. Matter has mass and volume. Mass is the amount of material (stuff)  something is made of. Mass is not affected by gravity. Materials are […]

Filed Under: Chemistry Tagged With: displaced, mass, matter, phases of matter, states of matter, volume

Measuring Volume

By Janice VanCleave

Teaching the Fun of Math

Notes from Janice’s Desk Most of my books use measuring tools that you have at home. This is purposely done to encourage more science discovery. I am not minimizing the importance of learning to use science equipment. My thought is that by mastering measuring skills using familiar measuring instruments, kids will be more successful in […]

Filed Under: Measuring Tagged With: measuring, volume

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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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