CIA Demonstration: Differences in Density Due to Temperature (1.2.3)

Question 1

Density is mass divided by volume. Less dense
objects float on top of more dense objects.

What will happen when cold water (colored blue) is
mixed with hot water (colored red)?

Answer 1

Density is mass divided by volume. Less dense
objects float on top of more dense objects.

What will happen when cold water (colored blue) is
mixed with hot water (colored red)?

Question 2

Just as energetic moving dancers take up more
space than conversationalists, energetic molecules
of hot water move around more quickly than
molecules of cold water. This causes a given mass
of hot water to take up a larger volume than the
same mass of cold water. The density of hot water
is therefore lower than the density of cold water, and
hot water therefore floats on cold water.

Answer 2

Just as energetic moving dancers take up more
space than conversationalists, energetic molecules
of hot water move around more quickly than
molecules of cold water. This causes a given mass
of hot water to take up a larger volume than the
same mass of cold water. The density of hot water
is therefore lower than the density of cold water, and
hot water therefore floats on cold water.

Question 3

Hot water molecules move more rapidly and occupy a larger volume, and are therefore less dense.

Answer 3

Hot water molecules move more rapidly and occupy a larger volume, and are therefore less dense.

Question 4

Density is mass divided by volume.

Answer 4

Density is mass divided by volume.