Simple Thermometer!

This experiment demonstrates the principle of air expansion due to temperature changes. A simple thermometer can be constructed using a transparent bottle, a straw, and colored water. The straw is inserted through a hole in the bottle's cap, ensuring it is airtight, and the bottle is partially filled with colored water so that the water level is visible within the straw. When both are touched with hands, due to body heat, air expands, exerting pressure on water which causes water to rise inside the straw. When hands are removed, air cools down and water level inside the straw decreases again. We can try this experiment with different warm materials. This observable change in water level within the straw serves as an indicator of temperature variations, effectively functioning as a basic thermometer. This experiment provides a clear visual representation of how air expands and contracts with temperature changes, illustrating fundamental concepts of thermodynamics and the behavior of gases. Learning Objective:

To understand how temperature-induced changes in air pressure can be used to measure temperature variations, illustrating the relationship between temperature, air pressure, and volume.

Learning Objective: To understand how temperature-induced changes in air pressure can be used to measure temperature variations, illustrating the relationship between temperature, air pressure, and volume.

Keywords: Air expansion, Temperature changes, Atmospheric pressure, Thermodynamics, Simple thermometer