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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

Changing Density Units

By Janice VanCleave

Density is a type of conversion factor that compares the mass of a specific volume. The basic metric unit for mass is gram, g.The basic metric unit for length is meter, m.The basic metric unit for volume is L or m 3. Use the density of calcium, Ca, found at Dynamic Periodic TableConvert the units of […]

Filed Under: Chemistry Tagged With: conversion factor, density

Floating

By Janice VanCleave

The density of a twelve pound bowling ball is greater than that of water, thus the ball sinks in water.

  Why Do Some Heavy Objects Float and Other Heavy Objects Sink?   New Terms buoyancy buoyant force density displacement fluid volume Whether an object sinks or floats in a fluid (liquid or gas), depends on several variables: 1. The density of the object in a fluid. (Density is the ratio of the object’s mass […]

Filed Under: Physics Tagged With: density, float, mass, water displacement

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

How to Date Eggs

By Janice VanCleave

The older an egg is the more buoyant it is in water. Buoyancy is the ability of an object to float in a fluid (liquid or gas). For example, helium balloons are buoyant in air and boats are buoyant in water. To test the freshness of an egg, fill a bowl with water. Then place […]

Filed Under: Physics Tagged With: buoyancy, date eggs, density, fluid

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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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