What is a concept or principle from the natural sciences that is relevant to Snow's work on anesthetics?

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

and after water is usually warmed by the sun the water temperature raises and then evaporates .