Question

What is the correct sequence when water is heated from below in a vessel?

Options

• Cool water rises → hot water sinks → convection current forms

• Water at bottom cools → density increases → water rises

• Water at bottom heats → density decreases → hot water rises → cool water sinks → convection current forms

• Water at top heats first → sinks → cool water rises

Answer 1

Water at bottom heats → density decreases → hot water rises → cool water sinks → convection current forms

Explanation:

Heat is applied from below, so the bottom water heats first and becomes less dense. It rises and is replaced by cooler water from above, and this continuous cycle sets up convection currents throughout the fluid.