What is the difference between Charles' Law and Boyle's Law?

Answer 1

Gases have diverse properties tat we can observe with our senses. These properties include gas pressure, temperature (T), mass, and the volume that contains the gas. Close scientific observation has confirmed that these variables are related to one another and that the values of these properties can determine the states of the gas. Boyle's law states that at a constant temperature the volume of a gas is inversely proportional to the pressure while Charles law states that the relationship between temperature and volume are proportional to one another.

Boyle's Law states that the product of the pressure and volume for a gas is a constant for a fixed amount of gas at a fixed temperature. The mathematical relationship of Boyle's law is given as PV=k (P= pressure, V= volume, k= constant). When the pressure of the gas was increased, the volume of the gas decreased. This can be seen when, as more weights are added onto a piston, the pressure increases while the volume decreases leaving less room for the particles to move around. So if the volume was 10 Liters and the pressure was 1 atm., the value of k was 10 L atm. This value for k is the same even after a 50 Kg. weight is added changing the volume to 8.39 Liters and the pressure to 1.18 atm.

Another law that states the relationship between temperature and volume when pressure is constant is Charles's law. The mathematical relationship is V/T=b (V= volume, T= temperature, b= a constant). As volume increases so does the temperature. The initial value for b (the constant) before the heating of the gas inside the piston chamber was around 0.017 L / K. This value was also the same or constant after increasing the temperature of the gas inside the piston by 10 degrees Celsius. Initially, for temperature of 25o C or 298 K the volume was 5 liters (pressure constant) and at 35o C or 308 K, the volume changed to 5.17 Liters but when you substitute these values into the equation V/T= b, b is the same value. Thus, even though the values change in both laws, the constant remains the same.

The constant in Charles law depends on the quantity of gas and the pressure. The ratio of volume to temperature for any set of volume - temperature values always equals the same. In Boyle's law, the constant for different gases can be determined by finding out the volumes and pressures.

Answer 2

Charles's Law states: At constant pressure, the volume of a given mass of an ideal gas increases or decreases by the same factor as its temperature (in Kelvin) increases or decreases. Volume /temperature = K (constant)

Boyle's Law states: Boyle's law states that at constant temperature, the absolute pressure and the volume of a gas are inversely proportional. Pressure Volume= K (constant)

It can also be stated this way: Forcing the volume V of a fixed quantity of gas to increase, while keeping the gas at the initially measured temperature, the pressure P must decrease proportionally. Conversely, reducing the volume of the gas increases the pressure.

These are gas Laws Scuba divers must know.