Concepts of Physics

IIT JEE Physics (1978-2018: 41 Years) Topic-wise Complete Solutions

Visualize heat getting converted into work

Objective

To visualize work done by the heat.

Introduction

Heat can be used to do work i.e., heat is a form of energy.

Apparatus

glass bottle with small opening, a coin

Procedure

Add some water in the bottle. Place a wet coin on its mouth. Rub your palms vigorously and hold the bottle between them. Closely watch the coin. It jumps (a bit) up and down for a few times.

Discussion

Air inside the bottle is cool. When it is brought between the palm, air inside the bottle gradually starts warming up. It expands and looks for an outlet. Pushing the coin it makes an escape.