Physics Balance A balance is an instrument for weighing the mass of an object. Commonly used are analytical balance, physical balance, student balance (simple physical balance), tray balance and so on. the physical balance, student balance and tray balance are commonly used in secondary school physics labs. All of the above balances are made using the principle of "equal forces acting on equal arms when the lever is in balance". Mainly composed of a travel code, scale, balance nut, base plate, indexing plate, crossbar pointer, heavy vertical line, etc..
the main technical parameters of the balance are weighing, sensitivity, etc.. Weighing capacity refers to the balance can weigh the maximum mass value (full value), often expressed in grams (g) as the unit. Sensitivity is to make the balance pointer from the balance position deflection to the dial a degree of the maximum mass required, so the sensitivity is also called "index value", often in "milligrams" (mg) as the unit, the sensitivity reflects the sensitivity of the balance. Technical parameters of the balance and variability, level, vernier scale error, weight accuracy, etc..