Question

nice, you just created your very own convection currents! when the water was heated up enough, it started moving and the convection currents formed.
but why? when water is heated its density changes, causing it to move. which of the below statements is correct?
a) hot water sinks as it is less dense than cold water
b) hot water sinks as it is denser than cold water
c) hot water rises as it is less dense than cold water
d) hot water rises as it is denser than cold water

Explanation:

When water is heated, its density decreases. Less - dense substances rise above more - dense substances. Cold water is more dense than hot water. So, hot water, being less dense, will rise.

Answer:

C. Hot water rises as it is less dense than cold water