If an object is than water, it will float. if it is than water, it will sink.

you should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.

Explanation:

1) less dense

2) more dense

hope this helps bebe :)

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.