Inversely proportional means that one variable goes up while the other goes down. Directly proportional means that both variables increase or decrease at the same time. ex: The volume of a gas at constant pressure is inversely proportional to gas pressure, thus this means that as pressure increases, the volume of the gas will decrease. ex: The volume of a fixed amount of gas is directly proportional to absolute pressure, thus this means that when you heat a gas the volume also increases.
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Directly proportional relationship is F=ma, F is directly proportional to a. Inversely proportional relationship is v=r/t, v is inversely proportional to t.
Force is directly proportional to mass provided the acceleration is constant.
Directly. That's why you can't move a car by blowing on it.
Directly proportional, at pressure and temperature constant.
Disproportional.If instead you're looking for the antonym of directly proportional, that would be inversely proportional.