Chapter 3 - Density

Density of an object
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Density of an object
mass divided by volume
If two objects have the same volume but one has a greater mass, the one with greater mass
Has a higher density
If two objects have the same volume but one is made up of smaller and heavier atoms, the one with small heavy atoms will
be more dense than the other.
If you cut a wooden block in half, each half would have
the same density as the original piece
In the water displacement method for finding volume
you subtract the initial volume from the final volume
If two objects have the same mass but different volumes
the one with the larger volume has the lower density
If the density of water is 1 gram/cm3 , this means that the mass of 100 cm3 of water should be
100 grams
Density is a characteristic property of a substance. This means that the density of water
Stays the same regardless of the volume
100 milliliters of water has a mass of 100 grams. If you measured the mass of 50 milliliters of water, the mass would be
50 g
To find the mass of water in a graduated cylinder, you could
Take the total mass of the water and graduated cylinder and subtract the mass of the graduated cylinder
An object should float in a liquid if it isLess dense than the liquidA tiny piece of sand is very light but sinks in water. This is becauseSand is more dense than waterWood floats in water. If you measured the mass of the same volume of wood and waterThe water would have a greater massA candle floats in water but sinks in alcohol. This is becauseThe water is more dense than the alcoholAlcohol is less dense than water. If you measured the mass of the same volume of alcohol and waterThe water would have a greater massA carrot floats in salt water but sinks in fresh water. This is becauseSalt water is more dense than fresh waterThe density of hot waterIs less than the density of cold waterThe density of hot and cold water are different mainly becauseThe molecules in hot water move faster and are slightly further apart