![]() ![]() In a spring scale, the spring either stretches (as in a hanging scale in the produce department of a grocery store) or compresses (as in a simple bathroom scale). The object to be weighed can be simply hung from the spring or set on a pivot and bearing platform. ![]() They are usually calibrated so that measured force translates to mass at earth’s gravity. Spring scales measure force, which is the tension force of constraint acting on an object, opposing the local force of gravity. This contrasts to a balance, which compares the torque on the arm due to a sample weight to the torque on the arm due to a standard reference mass using a horizontal lever. A Height & Weight Scale measures mass by reporting the distance that a spring deflects under a load. ![]()
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