When the dyed t-shirt is hung up to dry in a warm room, the water from the dye solution undergoes a physical change known as evaporation. Evaporation is the process by which a liquid, in this case, water, changes into a gas, usually due to an increase in temperature. As the water molecules gain energy from the warmth of the room, they gain enough kinetic energy to overcome the intermolecular forces holding them together in the liquid state, leading to their escape into the air as water vapor.
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