The Celsius scale is a way to measure temperature, and it is named after a Swedish scientist named Anders Celsius. This scale is popular all around the world.

It measures temperature based on two important points related to water:

• Freezing Point of Water: 0 °C (when water turns to ice)
• Boiling Point of Water: 100 °C (when water turns to steam)

These points are measured under normal air pressure.

What is the Celsius Scale?

The Celsius scale has 100 degrees between the freezing point and the boiling point of water.

If you want to change Celsius to Kelvin (which is another way to measure temperature), you can use this simple formula:

K = °C + 273.15

What is Absolute Zero?

Absolute zero is the lowest temperature possible. At this point, everything stops moving.

It is the same as 0 Kelvin (K) and -273.15 °C.

Here’s how you can think of it:

• Absolute Zero: 0 K = -273.15 °C

At absolute zero, materials have the least possible energy. The idea of temperature is linked to how fast tiny particles in a material are moving. At absolute zero, they don’t move at all.

Why the Celsius Scale is Important

The Celsius scale is important in studying heat and how things change with temperature.

It helps scientists understand:

• How heat moves from one object to another
• How materials expand or shrink with temperature
• How gases behave under different conditions

Everyday Uses of Celsius

We often use the Celsius scale in lots of daily activities, like:

• Weather: Most weather reports show temperature in Celsius.
• Science: Many scientists use Celsius when doing research in areas like chemistry and physics.

If you need to change temperatures from Celsius to other scales, here are the formulas you can use:

• Celsius to Fahrenheit: °F = (°C × 9/5) + 32

• Celsius to Kelvin: K = °C + 273.15

Key Points to Remember

• The Celsius scale measures temperature using the freezing and boiling points of water.
• There are 100 degrees between these two important points.
• Absolute zero (0 K) is the same as -273.15 °C, where all movement stops.
• The Celsius scale is used in science and everyday life, and we often need to change between temperature scales.

By understanding the Celsius scale and how it connects to absolute zero, we can better grasp the basics of temperature, energy changes, and how materials behave at different temperatures.