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Does hot and cold
water have the same density? This is a great activity to find the
answer.
You will need:
4 mason jars, red
and blue food coloring, a sample of hot water (not too hot - have adult
supervision), a sample of cold water (use ice cubes to make it really
cold), an index card.
Now try
this:
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Fill 2 mason jars completely to
the top with hot water. Add a few drops of red food coloring.
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Fill 2 mason jars completely to
the top with cold water. Add blue food coloring.
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Place an index card on top of 1
mason jar containing the red hot water. Carefully invert it on
top of 1 mason jar containing the blue cold water. When the
lids of the mason jars are completely lined up, carefully remove the
index card.
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Place an index card on top of 1
mason jar containing the blue cold water. Carefully invert it
on top of 1 mason jar containing the hot water. When the lids
of the mason jars are completely lined up, carefully remove the
index card.
What is
happening?
If hot water has a
higher density you will see the red hot water mix down into the blue
cold water. If cold water has a higher density you will see the
blue cold water mix down into the red hot water. What did you
observe?
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