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Charles's Law is an ideal gas law where at constant pressure; the volume of an ideal gas is directly proportional to its absolute temperature.

Jacques Charles studied the relationship between volume (V) and temperature (T) of a confined gas at constant pressure and saw how gas tend to increase in volume when heated. He observed that the ratio of volume and temperature remains nearly constant which can be given as:

V / T = constant = k (say)

V1 / T1 = V2 / T2

V1 . = V2 *T1

Charles Law

Table of Contents:

**Formula**

Gas Equation: V_{i}/T_{i} = V_{f}/T_{f} or V_{f}/V_{i} = T_{f}/T_{i} or V_{i}T_{f} = V_{f}T_{i}

**where,**

V_{i} = Initial Volume,

T_{i} = Initial Temperature,

V_{f} = Final Volume.

T_{f} = Final Temperature,

Charles's law (also known as the law of volumes) is an experimental gas law which describes how gases tend to expand when heated. It was first published by French natural philosopher Joseph Louis Gay-Lussac in 1802, although he credited the discovery to unpublished work from the 1780s by Jacques Charles. The law was independently discovered by British natural philosopher John Dalton by 1801, although Dalton's description was less thorough than Gay-Lussac's. The basic principles had already been described a century earlier by Guillaume Amontons.

__Example__:

Calculate the Final Temperature (T_{f}) by using the Charles’ Law Calculator.

Initial Volume (V_{i}) = 25 L

Initial Temperature (T_{i}) = 5 K

Final Volume (V_{f}) = 15 L

__Solution__:

**Apply Formula:**

Gas Equation: V_{i}/T_{i} = V_{f}/T_{f} or V_{f}/V_{i} = T_{f}/T_{i} or V_{i}T_{f} = V_{f}T_{i}

**Final Temperature (T _{f}) = 3 K**