ELI5: Explain Like I'm 5

Temperature

Temperature is a measure of how hot or cold something is. Imagine you have a cup of hot cocoa and a cup of lemonade. The hot cocoa is very hot and the lemonade is cold. We can measure the temperature of each of these drinks to see how hot or cold they are. We use something called a thermometer to measure temperature.

The thermometer has a special liquid inside that expands when it gets hot and contracts when it gets cold. The thermometer also has a scale that tells us how hot or cold the liquid inside is. The scale has numbers ranging from very cold to very hot. The units used to measure temperature are usually Celsius or Fahrenheit.

When things get hot, the molecules inside them start moving around really quickly. When they get cold, the molecules start moving more slowly. This is why things feel colder when they have less heat energy and why things feel warmer when they have more heat energy.

Temperature is important because it affects many things in our daily lives. For example, when we wear warm clothes on a cold day, we are trying to keep our bodies warm. When we cook food, we need to know the right temperature so that it cooks properly and is safe to eat.

In summary, temperature is how hot or cold something is and it can be measured using a thermometer. It's important to know the temperature of things so we can stay comfortable and safe.