Dry ice is the solid form of carbon dioxide, and it has a surface temperature of -109.3 degrees Fahrenheit (-78.5 degrees Celsius) . Dry ice sublimates at 194.7 K (−78.5 °C; −109.2 °F) at Earth atmospheric pressure. This means that it turns directly from a solid to a gas without melting into a liquid. Dry ice is used for temporary refrigeration as CO2 does not have a liquid state at normal atmospheric pressure and sublimates directly from the solid. It is denser than water, which means that it sinks in water, and its density grows as the temperature decreases: from 1.55 g/cm₃ to 1.7 g/cm₃. Dry ice is extremely cold, and it can cause severe frostbite if touched with bare skin. Therefore, it is important to handle it with insulated gloves or tongs.