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Thermal conductivity gauges rely on the fact that the ability of a gas to conduct heat decreases with pressure. In this type of gauge, a wire filament is heated by running current through it. A thermocouple or Resistance Temperature Detector (RTD) can then be used to measure the temperature of the filament. This temperature is dependent on the rate at which the filament loses heat to the surrounding gas, and therefore on the thermal conductivity. A common variant is the Pirani gauge which uses a single platinum filament as both the heated element and RTD. These gauges are accurate from 10 torr to 103 torr, but they are sensitive to the chemical composition of the gases being measured.

A Pirani gauge is accurate within what ranges?
Answer: 10 torr to 103 torr
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Plymouth Council is currently undertaking a project of urban redevelopment called the "Vision for Plymouth" launched by the architect David Mackay and backed by both Plymouth City Council and the Plymouth Chamber of Commerce (PCC). Its projects range from shopping centres, a cruise terminal, a boulevard and to increase the population to 300,000 and build 33,000 dwellings.

What architect is in charge of the ""Vision for Plymouth"?
Answer: David Mackay
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During the administration of U.S. President Martin Van Buren, nearly 17,000 Cherokeesalong with approximately 2,000 black slaves owned by Cherokeeswere uprooted from their homes between 1838 and 1839 and were forced by the U.S. military to march from "emigration depots" in Eastern Tennessee (such as Fort Cass) toward the more distant Indian Territory west of Arkansas. During this relocation an estimated 4,000 Cherokees died along the way west. In the Cherokee language, the event is called Nunna daul Isunyi"the Trail Where We Cried." The Cherokees were not the only American Indians forced to emigrate as a result of the Indian removal efforts of the United States, and so the phrase "Trail of Tears" is sometimes used to refer to similar events endured by other American Indian peoples, especially among the "Five Civilized Tribes". The phrase originated as a description of the earlier emigration of the Choctaw nation.

How many Cherokee-owned black slaves were also relocated between 1838 and 1839?
Answer:
2,000