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 The law was named after scientist Jacques Charles, who formulated the original law in his unpublished work from the 1780s.
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?
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?
V2 = (V1) [T2 / T1]
V2 = (400.0 mL) [(400.0 K) / (498.0 K)
V2 = 321 mL
Conclusion – I hope that you understand this concept Charles Law Formula And Definition and if you like this post, then share it with others.