When the volume of an "ideal gas" increases AND the amount (number of moles*) of gas remains constant, the temperature of the gas will decrease.
One relevant assumption for an "ideal gas" is that it is "dry" - no water vapor (humidity) in the sample
One relevant equation is the Ideal Gas Law P*V = n*R*T
When P = pressure in atmospheres
V = volume in liters
n = amount of the Ideal Gas, in moles
R = the ideal, or universal, gas constant = 0.08206 L*atm / mol * K
which is read as "liter-atmospheres per mole-Kelvin"
T = the absolute temperature in K, "Kelvins"
*A "mole" is 6.022×1023 atoms or molecules of a substance.
This is known as "Avogadro's Number"
Nothing happens if the volume is also allowed to increase.
No. Limestone changes to Marble when it undergoes intense heat and pressure.
It gets heated up and glows spreading the light
They will attempt to move apart. The effect of this on the gas contained therein depends on how rigid your container is. If you have a real flexible container like a balloon, the gas will increase in volume. If it's a rigid container like a gas cylinder, the pressure will go up.
When pressure differences are small you get light winds.
It expands.
The pressure is higher.
Usually they will increase.
it goes down
it goes down
it expands and/or its pressure rises, depending on conditions.
It heats up
A substance in the solid phase will typically expand when heated. Most substances when heated sufficiently will melt into a liquid, assuming that they do not combust or sublimate.
Its vapor pressure equals atmospheric pressure.
It is brittle
When a substance is heated, the kinetic energy of its particles increases. This leads to the particles moving faster and colliding more frequently with each other and the container they are in.
The speed of the gas particles will increase as they are heated. That is why the pressure in a container increases. The particles are hitting the walls of the container with more force as they are heated.