Thermometers are cool tools that help us figure out how hot or cold something is. They work by using materials that change size when the temperature changes.

How They Work:

1. Liquid Thermometers: These are the most common types. They usually use alcohol or mercury. When it gets warmer, the liquid inside expands and rises in a glass tube. This lets us read the temperature on a scale.

2. Digital Thermometers: These have sensors that detect temperature. They change the temperature readings into electrical signals and show the results on a digital screen.

Important Idea:

• Temperature vs. Heat: It’s important to know that temperature tells us how fast particles in something are moving. Heat is the energy that moves between things when they’re at different temperatures.

In simple words, thermometers are like our senses for checking how hot or cold it is!