Graham's Law of Gaseous Diffusion Graham's Law of Gaseous Diffusion states that the diffusion rate of a gas is inversely proportional to the square root of its density. The principal described in this law is used in the diffusion method of separating isotopes . Gravimetric Analysis Gravimetric analysis is the quantitative analysis of materials that depends on weighing. For example, the amount of silver in a solution of silver salts could be measured by adding excess hydrochloric acid to precipitate silver chloride, filtering the precipitate, washing, drying and weighing. The greenhouse effect is the increase in the temperature of the earth's atmosphere caused by the presence of certain gases.
Carbon dioxide plays an important role in warming the earth by trapping the sun's heat.
For millions of years the carbon cycle maintained a balance between the process that add and those that take away carbon from the air. In modern times, people have upset this balance by burning vast amounts of fossil fuels, and so releasing excess carbon dioxide into the atmosphere. A lot of tropical rainforest has been destroyed, which in turn has reduced the amount of carbon dioxide used up by green plants during photosynthesis. This has resulted in an increase in the concentration of carbon dioxide in the atmosphere. As the concentration of carbon dioxide in the air increases, more heat energy is trapped, and less is radiated out of the atmosphere.