Abstract
Abstract Fundamental relations are presented for the pressure within the system of a thermometer or thermal system charged with a perfect gas. An expression is developed which gives the approximate pressure in terms of bulb temperature, ambient temperature, and ratio of bulb volume to ambient volume, this being sufficiently accurate if the volume change of the pressure-responsive element is small. An exact equation for the pressure in the system is developed in terms of the temperatures and volumes of bulb, capillary, and pressure-responsive element, and the volume change of the pressure-responsive element, assuming the volume change to be linear with pressure change. From this relation, means are developed for determining the necessary charging pressure to give a specified pressure change when the bulb is varied through a specified temperature span. An example is included in the Appendix in which charging pressure, pressure-temperature curve, and the effect of ambient-temperature changes are computed by means of the exact expressions developed.
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