Glossary
139
conductivities of hydrogen and helium are six to ten times greater than most
organic compounds. The presence of even small amounts of organic materials
causes a large decrease in the thermal conductivity of the column effluent.
thermostated Control of the temperature is provided by a thermostat
top-level display The main item in a menu. This is the display that appears
first when the menu item is first accessed.
vapor pressure The pressure exerted by a vapor in equilibrium with its solid
or liquid form.
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