# Gay-Lussac’s law examples

Gay-Lussac’s law, also known as the pressure-temperature law, states that the pressure of a fixed amount of gas at a constant volume is directly proportional to its absolute temperature. In other words, as the temperature of a gas increases, so does its pressure, and vice versa, provided that the volume of the gas remains constant.

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## Examples

### Gas cylinder

When a gas cylinder is pressurized, the gas molecules are tightly packed together and have a certain temperature. According to Gay-Lussac’s law, the pressure of a gas increases with an increase in temperature, assuming the volume remains constant. If the gas cylinder is heated, the temperature of the gas inside will increase and cause an increase in pressure. If the pressure becomes too high, it can lead to an explosion, which is why it’s important to handle pressurized gas cylinders with care.

### Pressure cooker

The temperature and pressure inside a pressure cooker are directly related, as per Gay-Lussac’s law. As the temperature rises, the pressure inside the cooker also increases. This higher pressure leads to a higher boiling point of the water, allowing food to cook faster.

### Bullet

When a bullet is fired from a gun, the gunpowder inside the bullet casing is ignited, producing a large amount of gas. As per Gay-Lussac’s law, the pressure of the gas is directly proportional to its temperature. Therefore, the high temperature of the gas produced by the gunpowder increases the pressure inside the bullet casing, propelling the bullet out of the gun barrel.

### Tire tube

When a vehicle is driven, the friction between the tire and the road generates heat. This heat is transferred to the air inside the tire, increasing its temperature. As per Gay-Lussac’s law, the pressure of the gas inside the tire increases with temperature. Therefore, the pressure inside the tire also increases, which can lead to overinflation or a blowout if the pressure becomes too high.

### Heater filament

In a water heater, the electric filament heats up the water. As the temperature of the water increases, the pressure of the steam generated by the hot water also increases. According to Gay-Lussac’s law, the pressure of the gas is directly proportional to its temperature, so the pressure inside the water heater increases. If the pressure becomes too high, it can cause an explosion.

## Image credit

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