Which of the statements about melting point determination is not true?
The melting point is a physical measure of the forces holding the material into its crystal lattice.
The upper limit of the melting temperature range occurs when the last remaining crystal melts.
Pure substances typically have a melting range of less than 2∘ C.
The literature value of melting point is often quoted as only the lower limit.
The lower limit of the melting temperature range occurs when the first crystal starts to melt.