Thus, the coldest temperature theoretically possible is -273.15 ☌. On the Celsius scale the freezing point of water is set at 0 ☌, and the boiling point is 100 ☌. It is related to the Thermodynamic Temperature by the equation This is called the Celsius temperature, and the abbreviated symbol for Celsius is ☌. In fact, it is experimentally impossible to even reach 0 K.įor historical reasons it is also common to define temperature in terms of its difference from a reference temperature T 0=273.15 K, the freezing point of water. The coldest temperature theoretically possible is 0 K. The abbreviated symbol for the Kelvin is K. The SI base unit for temperature is the Kelvin.
The abbreviated symbol for the candela is cd. The SI base unit for luminous intensity is the candela. We will learn more about the mole later in this course. The abbreviated symbol for the mole is mol. The SI base unit for amount of substance is the mole. The abbreviated symbol for the ampere is A. The SI base unit for electric current is the ampere. The abbreviated symbol for the second is s. The choice of the kilogram instead of the gram as the base unit for mass is only for historical reasons. The abbreviated symbol for the kilogram is kg. The SI base unit for mass is the kilogram. A meter is slighly longer than a yard ( i.e., 1 m = 39.37 inches). The SI base unit for length is the meter. Let's look at the base units for some base and derived quantities. All other quantities can be derived from these base quantities using the equations of physics and chemistry. These base quantities are length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. The SI system defines seven base quantities, from which all other scientific quantities can be derived. Prefices indicate the size of the unit relative to a base unit. The metric system is easy to learn and use because subdivisions and multiples of base units employ only factors of 10. This is also called the metric system, with which you may already be familiar.
0 kommentar(er)
