Charles’s Law – Lab Report
Assuming that pressure remains constant, the volume and absolute temperature of a certain quantity of a gas are directly proportional. Mathematically, this can be represented as:
Temperature = Constant x Volume
Volume = Constant x Temperature
Volume/Temperature = Constant
Substituting in variables, the formula is:
Because the formula is equal to a constant, it is possible to solve for a change in volume or temperature using a proportion. Charles' Law explains the relationship between temperature and volume of a gas. Assuming that pressure does not change, if you double the absolute temperature of a gas it causes the volume of that gas to double. Temperature and volume are proportional. The volume of a gas increases by 1/273 of its volume at 0°C for every degree Celsius that the temperature increases. This relationship happens because while the gas molecules are moving around in their container in different directions and speeds, they will have an average amount of energy that is the temperature of the gas. The volume of the gas is the size of its container because the molecules will keep expanding until something stops it. But to move as they do, the molecules use kinetic energy. And kinetic energy is measured by temperature. So, the volume and temperature are very closely related. If the temperature was not sufficient, the molecules would not be able fill the container. Charles' Law must be used with the Kelvin temperature scale. This scale is an absolute temperature scale. At 0 K, there is no kinetic energy (Absolute Zero). According to Charles' Law, there will be no volume at that temperature. The Kelvin temperature scale is Celcius minus 273.15 °. Therefore, zero Kelvin would be -273.15 ° and any Celcius temperature can be converted by to Kelvin by adding 273.15 (273 is often used). Any unit of volume will work with Charles' Law, but the most common are liters (dm3) and milliliters (cm3).
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