**Charles Law Formula And Definition:** When the pressure on a sample of a dry gas is held constant, the Kelvin temperature and the volume will be in direct proportion. Charles law is also known as the **law of volumes**. The law was named after scientist Jacques Charles, who formulated the original law in his unpublished work from the 1780s.

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**Charles Law Formula**

The equation of the law shows that when the temperature of gas increases then volume also increases proportionally.

V ∝ T

where V is the Volume of the Gas

and T is the Temperature of the Gas

PV = k

- k may be a constant.
- P= Pressure
- V= Volume

**V₁/V₂ = T₁/T₂**

- V₁ = First Volume
- V₂= Second Volume
- T₁= First Temperature
- T₂ = Second Temperature

You can see the graph of Charles law in the figure given below:

**Charles Law Real Life Application:**

Some real-life applications of Charles law or law of volumes are:

**Hot Air Balloon**– The air inside the balloon expands which make it less dense**Bakery**– Yeast is used to release CO2 which expands with temperature.**Tyre**– Pressure inside tyre increases after driving**Basketball**shrinks when left outside in winters.

Now let’s solve some questions so that you can understand the concept easily.

**Solved Examples Charles Law**

Q1. 600.0 mL of air is at 20.0 °C. What is the volume at 60.0 °C?

Solution:

600.0 mL / 293.0 = V/ 333.0 K

V = 682 mL

Q2. At 225.0 °C a gas has a volume of 400.0 mL. What is the volume of this gas at 127.0 °C?

Solution:

V_{2} = (V_{1}) [T_{2} / T_{1}]

V_{2} = (400.0 mL) [(400.0 K) / (498.0 K)

V_{2} = 321 mL

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