1. The mercury-vapor pressure is low when the temperature of the amalgam is low, while the mercury-vapor pressure is high when the temperature of the amalgam is high.

2. The temperature range for ensuring the light output is narrow.

3. The saturate mercury-vapor pressure is lower than that of the liquid mercury at low or room temperature.

4. The temperature corresponding to the mercury-vapor pressure of 1.0Pa is different according to the different types of amalgam.