Question

To use Charles' Law, which of the following needs to remain constant?
A.Pressure and the number of moles of a gas
B.Pressure and temperature
C.Temperature and the number of moles of a gas
D.Pressure and volume
E.Temperature and volume

Answer 1

Charles' Law, often known as the law of volumes, describes how a gas expands as the temperature rises. A reduction in temperature, on the other hand, will result in a drop in volume. The ideal gas law is a specific instance of Charle's law. The law applies to ideal gases that are kept at constant pressure but have varying temperatures and volumes.

Complete answer: Charles Law is a law that is used to describe the effects of temperature on gases under constant pressure. When a gas is heated, the molecules receive more energy and move about, increasing the amount of space they require. It is named after Jacques Alexandre César Charles, a French physicist and pioneer of balloon flying. "The volume of any gas is precisely proportional to its temperature on the Kelvin scale under the same amount of pressure," says Charles law.
The volume of an ideal gas is exactly proportional to the absolute temperature under constant pressure, according to Charles law. When the pressure imposed on a sample of a dry gas is maintained constant, the Kelvin temperature and volume will be in direct proportion, according to the law.
The law of volumes (also known as Charles' law) is an experimental gas law that describes how gases expand when heated. The Kelvin temperature and volume will be in direct proportion when the pressure on a sample of a dry gas is maintained constant, according to a modern version of Charles's law.
This direct proportion connection may be written as:
$V \propto T$
As a result, if the temperature is twice, the volume will be twice as well.
Which means other parameters such as Pressure and number of moles are constant.
Hence option A is correct.

Note:
In 1787, Charles conducted an experiment in which he filled five identical containers with various gases. The temperature of these containers was then elevated to 80 degrees Celsius. He then saw that all of the gases had grown in volume by the same amount. Gay-Lussac mentioned this experiment in his paper from 1802. Charles deduced that the volume of a gas grows linearly with the absolute temperature of that gas under constant pressure.