At what temperature does solid ice and liquid water co-exist together (in $0^{\circ} C$)?

What is dry ice? What happens when the pressure under which it is stored is decreased to $1$ atmosphere?

State whether the following statement is true or false:
$-273^{\circ} C = 0 K$

The graph below shows the change of ice to steam. Observe the change of state from ice to water and water to steam,and write two inferences that can be drawn from this graph about these changes of state.

Boiling of a liquid takes place at

Choose the correct statement from the following: