it's cool. :) I understand your question. yes, space is a vacuum but it is pressurized within the suit or space capsule. So, basically, the gasses are carried in liquid form as they are more compact in that manner and easier for transport. in order to turn them into a gas, they will absorb large amount of heat as they expand. any fluid that expands will act like a heatsink as this process is performed. going from a high pressure liquid state to a medium suit pressure state and then finally to a low pressure open space state. at each stage this process will absorb heat voraciously. think of a large tank of liquid nitrogen held at a high pressure - even at sea level. if you allow the nitogen to evaporate / offgas, it will drop in temperature.