If the gas is contained at a constant volume, the pressure increases. If the gas is not contained, the pressure remains the same or drops.
it expands and/or its pressure rises, depending on conditions.
the gas expands and exerts more pressure on the sides of the cylinder. Basically, the pressure goes up due to a temperature increase.
Applying heat to a gas will make it expand. If the volume of the gas is restricted (i.e. it cannot expand) then the pressure will increase.
Expands because there's more energy for movement.
It expands as the surrounding air pressure lessens. It also cools along with the ambient temperature.
It expands.
It expands (escapes).
It expands, taking up more space, if there is no more space, pressure in the container increases.
it expands and causes pressure
The gas will expand as it is heated.
The behaviour of gas particles are completely different because they randomly move within provided space. For them to expand, we can increase the pressure or either increase the temperature slightly.
Any gas will expand when heated, assuming you keep pressure constant.