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If the density of an object is less than 1cm cubed, then the object will float. If the density of an object is more than 1cm cubed, then the object will sink.
The curved surface of the liquid in a graduated cylinder is called meniscus.
Density Allows us to compare the masses of different materials that have the same volume.
Solids Liquids and Gases
Concepts. Weight - can be measured in newtons using a spring scale. Mass - can be measured in grams using a triple beam balance. Volume - can be found by measuring the l*w*h by using a ruler or by measuring the displaced water by using a graduated cylinder. Displaced water can also be measured by using a overflow container.
Definitions Mass-the amount of matter in sometihing Weighit-the pull of gravity on something. Volume-the amount of space something takes up.
Density - How tightly packed the matter is.
If the mass of an object is less then the volume, the object will float even if the desity is higher than 1.
Mass divided by volume = Density
Submarines have tanks in it than can be filled with air or water, the submarine wants to go down, the tanks are filled with water, if the submarine wants to go up, the water will be let out and be replaced with air.
A hot air balloon works because warm air rises in cool air, the balloon is hot beacusenyou heat the air in the balloon by burning propane. When the balloon goes down, the hot air is let out.
All matter have two things in common: space and mass.
Solids have both a definite volume and definite shape. Liquids have definite volume, but no definite shape. Gases have neither a definite volume nor a definite shape.
Things can change from a state to another, for example, water. Water can be a solid, liquid or gas. When water freezes, it turns into a solid and when water gets to its boiling point and evaporates, it turns into a gas.
Copyright 2009 Wynne Wong
