water freezes at 0o celsius, so at -15oC it would be solid
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Mercury is a liquid at 25 degrees Celsius.
At negative 150 degrees Celsius, carbon would be in a solid state.
At -50 degrees Celsius, oxygen would be in a gaseous state. Oxygen condenses into a liquid state at temperatures below -183 degrees Celsius.
Acetone would be in liquid state at 25 degrees Celsius as its melting point is -95 degrees Celsius and boiling point is 56 degrees Celsius.
Gold would be in solid state at 20 degrees Celsius because its melting point is 1064 degrees Celsius.