We use different ways to measure temperature around the world. This happens because of history and practical reasons. Let’s break it down:

1. Celsius Scale

• The Celsius scale is popular in many countries.
• It is based on water. Water freezes at 0°C and boils at 100°C.
• This scale makes it easy to understand weather and cooking!

2. Fahrenheit Scale

• The Fahrenheit scale is mainly used in the United States.
• Here, water freezes at 32°F and boils at 212°F.
• It’s a bit confusing compared to Celsius, but people in the U.S. are used to it.

3. Kelvin Scale

• The Kelvin scale is mostly for science.
• It starts at absolute zero (0 K), which is the point where everything stops moving.
• This scale is important for scientific work because it helps with exact calculations in physics.

How We Measure Temperature

We use different tools to measure temperature:

• Thermometers: These are the most common tools. They have liquids inside (like mercury or alcohol) that expand or shrink when the temperature changes.
• Thermocouples: These are used in factories or science labs. They measure temperature by checking the voltage difference when two different metals are joined and heated.

In summary, whether it's Celsius, Fahrenheit, or Kelvin, the main goal is to talk about temperature clearly. Each scale is useful in its own way!