Chemistry

Units of measure


Matter, being a body or a substance, and energy can be quantitatively evaluated. Each characteristic that can be quantified constitutes a physical quantity.

Physical quantity

Length, mass, temperature, time, volume, strength, amount of matter, etc. These quantities are evaluated by the units of measure adopted by convention and each unit has its symbol.

For example, the m The symbol of the meter. The value of a quantity may be expressed by a number and a unit of measure. Example: 25 ° C, 100m.

Unit of measure systems

A unit group is known as a unit of measure system. The most used is the SI (International System of Units). Note the SI units:

GREATNESS

UNIT NAME

SYMBOL

pasta

kilogram

Kg

length

subway

m

time

second

s

electric current

ampere

THE

temperature
thermodynamics

Kelvin

K

area

square meter

pressure

Pascal

Pan

force

newton

N

light intensity

Candela

CD

amount of matter

Mol

mol

velocity

meters per second

m / s

energy

joule

J

Electric tension

volt

V

volume

cubic meter

potency

watt

W