This warming is in addition to carbon dioxide's better-known effect as a heat-trapping greenhouse gas. For scientists trying to predict global climate change in the coming century, the study underscores the importance of including plants in their climate models.
It is a physical change. All phase changes are physical, not chemical. The chemical composition of water does not change when it changes from a liquid to a gas, or for that ma â¦ tter, to a solid.
Figure 4-2. These drawings show how much heat is required to generate one pound of steamat 100 pounds per square inch pressure. Note the extra heat and higher temperature required tomake water boil at 100 pounds pressure than at atmospheric pressure.Note, too, the lesseramount of heat required to change water to steam at the higher temperature. Figure 4-1.he amount of heat (ex-pressed in Btu) required to change apound of boiling water to a pound ofsteam. This same amount of heat isreleased when a pound of steam iscondensed back into a pound of water.This heat quantity is different for everypressure/temperature combination, asshown in the steam table.