Question

Two test tubes full of water heated one from below and other other near the top. In which case will the water heater faster and why?

Answer 1

in the first case the water will get hot faster Bcz when we will heat the water from bottom then due to gravity the cold water molecules will move come at the bottom of the tube and the molecules those are heated will move due to their light weight ...while in the other case only the top molecules will become not the entire water molecules.