![]() ![]() The units of fundamental quantities are expressed as follows to determine the dimensions of physical quantities:Įxample: The area is equal to the sum of two lengths. The dimension of the amount in that base is the exponent of a base quantity that enters into the expression. The letters L, M, and T are used to represent the three basic dimensions of length, mass, and time in mechanics.Īll physical quantities can be stated in terms of the fundamental (base) units of length, mass, and time, multiplied by some factor (exponent). In terms of dimensions, a dimensional formula is an equation that expresses the relationship between fundamental and derived units (equation). The dimensional formulae of fundamental quantities like mass, time and length can be written as, and respectively.įor finding the dimensional formula of density, its formula can be simplified using the basic fundamental quantities. ![]() Square brackets are used to symbolise it. The dimension formula is a collection of fundamental quantities generated from physical quantities derived units. Where mass is the amount of matter a substance contains and its unit is kgĪnd volume is the amount of space an object occupies and its unit is m3 Because particles have mass, the more particles you can cram into a given volume, the heavier the substance. More particles can fit into a given volume if the particles of a substance are kept neatly and closely together. ![]() Each substance has a distinct density, which is determined by how the material’s particles are packed together. The mass of a material substance per unit volume is known as density. ![]()
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