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How to any sums in  physics using formulas?
Formula used to solve physics problem consists of n variables .

Out of these n variables , we will be given values of (n-1) variables.

we will substitute the values of (n-1) variables in the formula and calculate the value of unknown variable.

Example :-

Let us consider ideal gas equation , P V = n R T

where P is pressure , V is volume , n is number of moles , R is universal gas constant and T is absolute temperature.

Ideal gas equation has 4 variables , pressure P , volume V , number of moles n and absolute temperature T.

R is universal gas constant and its value is known.

Hence out of these four variables , three variables are given .

Hence by substituting values for three variables , fourth unknown variable is calculated .

Suppose the question is

" what is volume occupied by  0.1 mole of nitrogen gas if pressure is 5 atmosphere and temperature is 300 K ? "

We are given , n = 1 , P = 5 atm. = 5 × 1.01 × 105 Pa and T = 300 K

Hence
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