Temperature is important for understanding our world, and different countries use different scales to measure it. The three main temperature scales are Celsius, Kelvin, and Fahrenheit. Let’s break each one down:

1. Celsius (°C):

   • This scale is based on water.
   • Water freezes at 0°C and boils at 100°C.
   • It's used in most countries for everyday temperature readings.

2. Kelvin (K):

   • This is the scientific way to measure temperature.
   • It starts at absolute zero, which is really cold!
   • Absolute zero is 0 K, which equals -273.15°C.
   • You can find the Kelvin temperature by adding 273.15 to the Celsius temperature. (So, $K = °C + 273.15$).

3. Fahrenheit (°F):

   • This scale is mostly used in the USA.
   • In Fahrenheit, water freezes at 32°F and boils at 212°F.
   • This scale is based on how humans feel temperatures.

Each of these scales has its own purpose in science and in everyday life. They help us understand temperatures clearly!