Most houses do. The groundbreaking experiment was carried out onboard the Mir space station last year as part of the French-Russian Perseus mission. That gentle squeeze raised the temperature of the gas above that of the cell walls. For this to happen, heat must have been transferred from the cooler walls to the hotter gas, scientists report in the 1 May Physical Review Letters. Common sense tells us that liquids are different from gases.
Liquids are dense, gases are light.
It is both and neither. And once a fluid reaches the critical point, you can forget all the intuition you developed by watching water boil. In a normal liquid, heat is transferred in one of three ways. First, it can diffuse from hot regions to cold regions. This is what happens when you heat a pan of water on the stove.