ELECTROCARIAN

3.1 WEIGHING 3.1.1 Definition A weighing scale  is a measuring instrument for measuring the weight or mass of an object. There are two techniques used for measurements: ·          Spring scale Measurement ·          Analytical Measurement 3.1.2 Techniques of weighing 3.1.2.1 Spring scale A spring scale measures weight by the distance a spring deflects under its load. A balance compares the unknown weight to a standard weight using a horizontal lever. This process uses a spring with a known spring constant (see Hooke's law) and measure the displacement of the spring by any variety of mechanisms to produce an estimate of the gravitational force applied by the object. Weighing scales are used in many industrial and commercial applications, and products from feathers to loaded tractor-trailers are sold by weight. Specialized medical scales and bathroom scales are used to measure the body weight of human beings. Spring scales measure weight, the local force of gravity on an ob