Explanation

(a) SURFACE TENSION = \(\frac{\text{force}}{\text{length}}\)

FORCE = mass x accel. due to gravity

Dimension of force = M.LT\(^{-2}\)

Dimension of length = L

Dimension of surface area = \(\frac{MLT^{-2}}{L}\) = MT\(^{-2}\)

(b) The instruments used for measuring the force of gravity at a place are:

(1) Gravimeter, (2) Spring balance, (3) Gravitational accelerometer.

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