At which point could the substance shown exist as a gas or a solid but not a liquid?
If a solid changes into gas state without being a liquid first , this change of state is called sublimation . Iodine solid and solidified carbon dioxide (i.e. dry ice ) are examples of substance that sublime . The opposite process of sublimation is deposition . I.e. When a gas turns into a solid directly . The formation of frost is an example of deposition .