A solid substance is placed in a boiling tube and heated steadily. The temperature-time graph of the substance is shown in figure. At which labelled point would the substance be a mixture of liquid and gas?
A1
B2
C3
D4
A solid substance is placed in a boiling tube and heated steadily. The temperature-time graph of the substance is shown in figure. At which labelled point would the substance be a mixture of liquid and gas?
A1
B2
C3
D4