Question

Define Charles Law. Give Its mathematical formula?

Answer 1

Part 1: Charles’ law:

• According to this law, at constant pressure, the volume of a given gas is directly proportional to its temperature.
• It gives the relationship between the volume and temperature of a gas.

Part 2: Mathematically:

$\mathrm{V\alpha T}$ (At constant pressure)

$\frac{\mathrm{V}}{\mathrm{T}}=\mathrm{Constant}$

V = volume

T= temperature

or

$\frac{{\mathrm{V}}_1}{{\mathrm{T}}_1}=\frac{{\mathrm{V}}_2}{{\mathrm{T}}_2}$

Part 3: Graphical Representation Of Charles Law:

• ISOBAR- The graph between V and T at constant pressure is known as isobar or isoplestics and it always gives a straight line.
• A plot of V versus T (°C) at constant pressure is a straight line at – 273.15°C.
• -273.15-degree Celcius is the lowest possible temperature.