Massafraktio

Massafraktio is a dimensionless quantity used in chemistry and physics to express the concentration of a constituent in a mixture or solution. It is defined as the ratio of the mass of the constituent to the total mass of the mixture. The formula for mass fraction is typically represented as w_i = m_i / m_total, where w_i is the mass fraction of component i, m_i is the mass of component i, and m_total is the total mass of the mixture. Mass fraction is often expressed as a decimal, a percentage, or parts per thousand (ppt).

Unlike molar fraction, mass fraction is independent of the molar masses of the components. This makes it particularly useful when dealing with mixtures where the chemical formulas or molar masses are not precisely known or when comparing the relative amounts of different substances based on their actual mass contributions. For example, in industrial processes, the purity of a material is frequently specified by its mass fraction. It is a fundamental concept in understanding chemical compositions and is applied in various fields, including analytical chemistry, materials science, and environmental science.