Is alwayes sublimation point higher than melting point?

Answer 1

This question is unanswerable because anything that sublimes won't ever melt.

Because sublime = the change from solid to gas, while at no point becoming a liquid.

and melting = the process of heating a solid substance to a liquid

I would beg to differ. Sublimation depends on other variables as well, i.e. pressure. (lower pressure)

Water is a substance that sublimates and melts. It's sublimation point is actually lower than it's melting point (if it were higher the substance would be in it's transition state... defeating the purpose)

I don't know nearly enough to tell you anything else, except that in a single substance, it is more likely that the sublimation point is lower.

Answer 2

Not always. Sublimation point can be higher or lower than melting point depending on the substance. Sublimation occurs when a solid changes directly into a gas without going through the liquid phase, so the sublimation point can be different from the melting point.

Answer 3

the sublimation point in such things there are 5 in each sublimation point.