Question

when the gas in a container is heated the pistons move outwards explain why

Answer 1

Answer:

Hi buddy

Why does the pressure increase when a gas is heated in a container?

Temperature and pressure calculations. When a gas is trapped inside a container which has a fixed size (its volume cannot change) and the gas is heated, the particles will gain kinetic energy which will make them move faster. ... This causes the force on the walls of the container to increase and so the pressure increases.

Answer 2

$\huge\mathfrak\red{Reason:-}$

For the ideal gas law to be valid, we must have that if the pressure decreases, the temperature decreases by the same amount, and vice versa.

It doesn't make much sense intuitively for the temperature of the gas to decrease, which would mean that the pressure also decreases, as long as we have the constant heat source and no work being done.

It is a positive quantity as heat is being added to the system.