Proportionality is a rational or ratio property.
Ratios are expressed with a colon. [:]
Direct proportionality would be expressed as 1:1
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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 proportional, at pressure and temperature constant.
Directly. That's why you can't move a car by blowing on it.
Directly proportional means that both variables increase or decrease at the same time.