relative volatility
...that relative volatility in a liquid mixture of chemicals measures the difficulty of separating them by distillation?
...that <b id="mwE-g"><a href="./Relative_volatility" id="mwE-k" rel="mw:WikiLink" title="Relative volatility">relative volatility</a></b> in a <a href="./Liquid" id="mwE-o" rel="mw:WikiLink" title="Liquid">liquid</a> <a href="./Mixture" id="mwE-s" rel="mw:WikiLink" title="Mixture">mixture</a> of <a class="mw-redirect" href="./Chemical" id="mwE-w" rel="mw:WikiLink" title="Chemical">chemicals</a> measures the difficulty of separating them by <a href="./Distillation" id="mwE-0" rel="mw:WikiLink" title="Distillation">distillation</a>?