Which Metal is in liquid state at room temperature?

How much heat must be removed from room temperature (20 C) nitrogen gas to produce 1.0L of liquid nitrogen?

A certain winding made up of copper has a resistance of 100Ω at room temperature. If the resistance temperature coefficient of copper at 0 °C is 0.00428 /°C, calculate the winding resistance temperature E increased to 50°C. Assume room temperature at 25°C.

A certain winding made up of copper has a resistance of 100 at room temperature. If resistance temperature coefficient of copper at 0 °C is 0.00428/°C, Calculate the winding resistance if temperature is increased to 50 °C. Assume room temperature as 25 °C.