What is the difference between inverely and directly proportion in physics?

Answer 1

It is not only in Physics a general mathematical concept!

See you have rice stock in your house. If more people are there to consume it then it would last only for less days.

If only less members are to consume then it would last long for more days.

Hence with a fixed stock of rice, more memebers less days or less members more days

This is what we call inverse relationship

Same way in physics, for a given mass of gas at constant temperature, as volume decreases, then pressure increases. Or as volume increases, then pressure decreases

Suppose you have to fix flowers on a ribbon at half feet gap. Then greater the length more number of flowers are to be used. If the ribbon's length is made less then only less number of flowers are needed. So greater the length, more the flowers. Less the length, less number of flowers.

This is what we call as direct relationship

In physics at constant volume of a given mass of gas, as temperarture increases, then pressure also increases and vice versa.

Answer 2

In direct proportion, two quantities change in the same direction - as one increases, the other also increases. Inversely proportional quantities change in opposite directions - as one increases, the other decreases. This relationship is often described using mathematical equations involving constants of proportionality.