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PRERNA FOR IAS
CHARLES’S LAW
1. Law Statement of Charles’s Law
Charles’s Law states that for a fixed mass of gas at constant pressure, the volume of the gas is directly proportional to its absolute temperature. This means that when the temperature of a gas increases, its volume also increases, provided the pressure remains unchanged. Similarly, when the temperature decreases, the volume decreases. The law was discovered by the French scientist Jacques Charles and is one of the fundamental gas laws. It explains the behavior of gases under changing temperatures and helps scientists understand expansion and contraction in gases. Charles’s Law is widely used in physics, chemistry, and engineering.
2. Formula of Charles’s Law
The mathematical expression of Charles’s Law is:
V ∝ T
or
V₁/T₁ = V₂/T₂
where V represents the volume of the gas and T represents the absolute temperature measured in Kelvin. The formula shows that volume and temperature are directly proportional when pressure remains constant. If the temperature doubles, the volume also doubles. This relationship is useful for calculating changes in gas volume when temperature changes. The formula is widely applied in gas storage, industrial processes, weather studies, and scientific experiments. It provides a simple method for predicting the behavior of gases under varying temperatures.
3. Key Idea of Charles’s Law
The key idea behind Charles’s Law is that heating a gas causes it to expand, while cooling causes it to contract. When a gas is heated, its particles gain kinetic energy and move faster. These faster-moving particles spread farther apart, increasing the volume of the gas. Conversely, when the gas is cooled, the particles move more slowly and come closer together, reducing the volume. This direct relationship between temperature and volume exists only when pressure remains constant. The concept explains many everyday phenomena, such as balloons expanding in warm weather and shrinking when exposed to cold temperatures.
4. Main Points of Charles’s Law
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Charles's Law explains how gas volume is directly proportional to absolute temperature. Learn the formula, key concepts, and real-life applications in physics.
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