What is used to observe things, like cells, that are too small to see with the naked eye.

Which metal exist in liquid state and can be cut with knife ?

Assuming complete dissociation of the solute, how many grams of kno3 must be added to 275 ml of water to produce a solution that freezes at -14.5 c? the freezing point for pure water is 0.0 c and k_f is equal to 1.86 c/m

Is the flow of energy during vaporizing more like the flow during melting or during freezing