Mathematics gives precision to science. Scientists calculate everything from the number of atoms in a gram of hydrogen to the heat of the sun, and from the width of a galaxy of stars to the number of calories in a chocolate bar. Using English to Calculate Mathematical relationships can be expressed in sentences using phrases like ”is equal to”, ”is proportional to” and ”is the product of”. ...The weight of the air at sea level is equal to 14.7 pounds per square inch. => 14.7 pounds weight = 1 square inch | The pressure inside your body equals the pressure outside. => pressure1 = pressure2 | The pressure on a diver is thus equal to the weight of the atmospheric pressure plus the water pressure. => pressure on diver = atmospheric pressure + water pressure | The pressure of the water is directly proportional to the depth. => water pressure ∝ depth