Which one of the following is a nondimensional quantity? (1) Gas constant (2) Strain (3) Co-efficient of viscosity (4) Plank's constant

Which one of the following is a nondimensional quantity? (1) Gas constant (2) Strain (3) Co-efficient of viscosity (4) Plank's constant
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(2) Strain Explanation: A dimensionless quantity is simply a quantity that has no units and therefore no dimensions. A ratio between two numbers is a non-dimensional or dimensionless quantity. Strain which is defined as change in dimension over original dimension has no dimensional formula. So it is a. dimensionless quantity.
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