Tag Info  Hot answers tagged   NaCl melts at around 800°C.
Molten NaCl has a density of about $1.556 \frac{g}{cm^3}$[1], at
room temperature (solid) it has one of $2.71\frac{g}{cm^3}$ [2].
Sadly I could not find a value for the density at barely
underneath melting point but I strongly assume that the density
is a strictly monotonously falling function of temperature.
Therefore solid NaCl ...   It is because you wouldn't hide in
the corners like your kitty does! A electric radiator is
designed to be directional and therefore it doesn't heat the
unnecessary part of your room. It makes you feel warming in
front of it, but some part of the room don't get heated like
those corner and the ceiling. In comparison, a vacuum cleaner
heating the gas ...