Chemistry: Does someone know what a 1 base unit is in chemistry can someone give full explanation ♡​

one of a set of fundamental units in a system of measurement that is based on a natural phenomenon or established standard and from which other units may be derived The base units of the International System of Units are the meter, kilogram, second, ampere, kelvin, mole, and candela.

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

a) the particles of the chair are strongly held together.