surface tension is a scalar quantity because it has no specific direction.
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tension is a vector!(At first I thought it was a scalar too but this afternoon it was in our physics quiz,I answered scalar but I got it wrong because tension is a vector).this is the explanation:tension is the force producing such deformation.anything with force is a vector.Force always has direction.
Surface tension is a scalar quantity because it represents the force per unit length acting perpendicular to a line drawn on the surface of a liquid. It only has magnitude and no direction.
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A scalar is a magnitude that doesn't specify a direction. A vector is a magnitude where the direction is important and is specified.