In nature, there are a large number of the most diverse forces affecting objects and the environment.Each of them has its own unique nature and has a definite impact on the environment.To study and measure the effects and introduced the term "physical quantity".The strength of the pressure, temperature, friction and other values have their own numerical and literal value.Even similar physical quantity such as temperature, may be measured in different units, such as Celsius, Fahrenheit or Kelvin and the pressure can be measured in Pascals or bars.
Many countries have used to refer to the weight or the length of their unique performance.Units of physical quantities are different.For example, in the United Kingdom estimated the distance in yards and miles, and in Russia for this purpose already in meters and kilometers.To unify evidence was introduced a special system of SI.She allowed in textbooks, books, various projects use universal international units.It clearly painted alphabetic, numeric indicators, each physical quantity has its symbol and the numeric value.
Technological advances have led to an increase in the chemical and oil refineries.Tracking the process is carried out on modern production facilities with automatic production control.For its proper functioning must be constantly to measure physical quantities that are involved in the process.This is done by means of instrumentation, data from which come to the center automation, where after processing the system issues a decision on the change or continue working.Automation Center can simultaneously handle up to several thousand data and react instantly to the slightest change in pressure or temperature during production.With the instrumentation and automation is possible to calculate consumption of the product ingredients, calculate the required human and energy resources, as well as a large number of other data, which will be provided thanks to the clarity and consistency of the implementation process.They allow you to automate the production, improving the quality of products.
physical magnitude studied science of metrology.Specialists in this field is determined not only the importance and the value of the designation, as well as establish the regulations on permissible measurement errors for each value.They conduct verification and calibration of measuring instruments, each of which must be put on record, a passport and checked for compliance with its specifications.
physical quantity - it is the unit of measurement, allowing us to obtain an idea of the force of impact.It can have different numerical value, but the drive letter must comply with international norms and standards.
