What is equation?

Equation is a mathematical or chemical representation as a linear array of symbols expressing the quality of two things, separated into left and right sides by an equal sign.
Arrhenius’ e. An equation relating chemical reaction rate with temperature.
Bohr’s e. The equation for calculating the volume of the dead space gas in the respiratory tract by measuring the expired air and subtracting it from the alveolar gas volumes.
Einthoven’s e. See Einthoven’s law, under law.
Hasselbalch’s e. See Henderson-Hasselbalch equation.
Henderson-Hasselbalch e. An equation for determining the pH of a buffer solution such as blood plasma; pH=pK+log.

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