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# 26.21: U

Difficulty Level: At Grade Created by: CK-12
universal gas law
relates the volume of a gas with pressure, temperature, and number of moles of gas; written mathematically as \begin{align*}PV = nRT\end{align*}
universal gas law constant (R)
constant equal to \begin{align*} \frac {PV} {nT}\end{align*}, where the pressure, volume, moles, and temperature of the gas are represented by \begin{align*}P\end{align*}, \begin{align*}V\end{align*}, \begin{align*}n\end{align*}, and \begin{align*}T\end{align*}, respectively; the value and units of R depend on the units of \begin{align*}P\end{align*} and \begin{align*}V\end{align*}, and two commonly used values of R are \begin{align*}0.08206 \ \mathrm{L} \ \mathrm{atm}\ \mathrm{K}^{-1} \ \mathrm{mol}^{-1}\end{align*} and \begin{align*}8.314 \ \mathrm{J} \ \mathrm{K}^{-1} \ \mathrm{mol}^{-1}\end{align*}
unsaturated compound
an organic molecule containing double or triple bonds
unsaturated solution
a solution in which a given amount of solvent has dissolved less than the absolute maximum amount solute at that temperature
unshared electron pair
an unshared electron pair, also known as a non-bonding pair of electrons or as a lone pair of electrons, is found in a filled valence orbital that is not used in the formation of a covalent bond

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