I would say heat, but I might be wrong
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➷ It would depend on whether they would create an endothermic reaction or exothermic. For a hot pack, the chemicals would need to release energy (heat). However, a cold pack would need chemicals that need to draw heat from the surroundings to produce a cool sensation.
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➶ Hope This Helps You!
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Two properties of a star is luminosity and temperature.
Wastes
Fuel
Smoke
Gas
Toxic chemicals