1. A balance scale uses the sample weight to compare the arm torque using a lever which is horizontal.A horizontal lever is used to show the weight in case of a balancing scale.
    I think you have really done well.

  2. Balances are different from scales, in that a balance measures mass (or more specifically gravitational mass), where as a scale measures weight . Weighing scales are used in many industrial and commercial applications, and products from feathers to loaded tractor-trailers are sold by weight.

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