If an objects is heated and placed in a vacuum once heat has been removed will it lose heat faster?

Question

How does pressure affect temperature. As I understand as you increase pressure temp increases and vice versa. However how fast do objects return to room temp in a vacuum? Conversly if that same object is put under pressure how does that affect it going to room temp after it's heated???

Answer 1

The reference shows how pressure affects temperature for an ideal gas. Heat can enter or leave an object in a vacuum only by radiation. If it absorbs more radiant heat than it radiates away, its temperature will increase. Putting a solid or liquid under pressure doesn't affect its temperature unless you apply a LOT of pressure. Heat and pressure on coal forms diamonds. If applying pressure changes the heat flow, it's because of how you apply the pressure, not by the pressure itself.

Answer 2

If it's a true vacuum the object will lose no heat... Since heat is basically the speed of atomic particles (molecules, atoms, subatomic particles); in a true vacuum there are no particles except those in the object, so there is no way for the heat to transfer to the surrounding air (because there is none). Some thermoses have vacuums in their insulation because vacuums don't transmit heat at all.

There are three types of heat; radiation, convection, and conduction. Convection and conduction are interactions of the particles, radiant heat is actual energy being spewed from some source exciting molecules even though there may be a vacuum between the source and the object being heated (like the sun). If an object is heated, it mostly loses that heat through convection and conduction... normally radiant heat is through the release of energy by chemical processes.

So, if an object has a lot of air around it (high pressure) it should lose its heat faster because there are more air molecules bombarding the heated object's molecules, resulting in a faster transfer of heat energy from the object to its surroundings.

Answer 3

In vacuum without contact to anything, the only way the heat can be transferred away from the object is by radiation since other means require being in contact with other particles.

(Also see conduction and convection)

Answer 4

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