OHST Practice Exam

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Prepare for the OHST Exam. Use diverse question formats and detailed explanations to enhance your study experience. Ace your certification!

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One torr is defined as the pressure of what measurement?

One inch of water column
29.92 inches of mercury
One mm of mercury
One inch of lead

The correct answer is: One mm of mercury

One torr is defined as the pressure exerted by a column of mercury that is 1 millimeter high. This is grounded in the definition of the torr, which is based on the mmHg (millimeters of mercury) measurement. The torr is historically linked to barometric pressure and is equivalent to 1/760 of standard atmospheric pressure, which is measured at sea level. Understanding the relationship between torr and other pressure units helps clarify why this definition is critical. While the other options refer to different units of pressure, such as the inch of water column or various measurements related to inches of mercury, only the definition relating to millimeters of mercury aligns with the accepted scientific standards for pressure measurement.