Question

in water heat travels upwards much faster than it travels downwards

Answer 1

Hey Friend!!
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When there is heat at the bottom of water, the water molecules that are hot starts to move, thus the water molecules spread apart. The heated water becomes less dense.

The less density water molecules rise to the top where it can find water with same density.

In this process, it pushes the other water molecules that were in its way. These molecules are pushed down.

At the same time, new water molecules fill the space left by the heated molecules that rose up. This brings a circular motion. Thus water heated at the bottom travels up, cools down, gets denser, falls down. The cycle continues.
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Answer 2

The reason is that less density water molecules rise to the top of the water. The upper molecules are pushed down.
water molecules fill the space left by the heated molecules.
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