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.
With the addition of heat to â¦ the substance, the H2O, in the form of ice, undergoes what is called a phase change, which is the transformation of a solid to a liquid to a gas. Therefore, since the substance still remains to be H2O, it is considered to undergo a physical change.