The melting/ freezing point of a substance would tell you whether it is a solid at 20 degrees C. Most substances have the same melting and freezing point and is sometimes referred to as the normal point. If the normal point of a substance is above 20 degrees C then that substance is a solid at 20 degree C. Consider water--it has a normal point of 0 degrees C. This says, if temp is dropping then water, in its liquid form, turns to ice at 0 degrees C. Conversely, if temp is increasing then water, in it's solid form, will melt at 0 degrees C.
Answers & Comments
Verified answer
The melting/ freezing point of a substance would tell you whether it is a solid at 20 degrees C. Most substances have the same melting and freezing point and is sometimes referred to as the normal point. If the normal point of a substance is above 20 degrees C then that substance is a solid at 20 degree C. Consider water--it has a normal point of 0 degrees C. This says, if temp is dropping then water, in its liquid form, turns to ice at 0 degrees C. Conversely, if temp is increasing then water, in it's solid form, will melt at 0 degrees C.
For melting point data, go here: http://lxsrv7.oru.edu/~alang/meltingpoints/downloa...