The process of measurement is basically a process of comparison. The chosen standard of measurement of a quantity, which has essentially the same nature as that of the quantity is called unit of the quantity. Magnitude of a quantity (Q) = size of its unit `(u)xx` number of times (n) this unit is contained in the quantity. i.e. Q = nu As magnitude of a quantity remains the same, whatever be its units of measurement, therefore, `Q = n_1u_1 = n_2 u_2` Read the above passage and answer the following questions : (i) The value of acceleration due to gravity `(g) = 9.8 m//s^2` How do you express it in `km//hr^2` ? (ii) Our world is a game of numbers. Do you agree ? Justify.

Explanation

(i) `g=(9.8m)/(1s)^2 = (9.8xx10^(-3)km)/((1)/(60xx60)hr)^2 = 1.27xx10^5 km//hr^2`
(ii) Yes, ceerainly. In every walk of life, we play with number. For example : who is taller, who is havier, who has broken world record in any game : which is the tallest building, which is the highest mountain peak , who is suffering from disbetes, hypertension, liver ailment, kidney ailment and so on. Everything is every sphere of life, revolves around numbers.