Certified Hyperbaric Technologist Practice Test 2026 – Comprehensive Exam Prep

To convert ATA (atmospheres absolute) to mmHg (millimeters of mercury), you should multiply the ATA value by 760 mmHg because one atmosphere is defined as being equivalent to 760 mmHg. This conversion is based on the definition of atmospheric pressure, where standard atmospheric pressure at sea level is defined as 1 atm = 760 mmHg.

If you are given a pressure value in ATA and wish to convert it into mmHg, you simply take that value and multiply it by 760. For example, if the ATA is 1, performing the calculation (1 ATA × 760 mmHg/ATA) gives you 760 mmHg, which confirms that the conversion is accurate.

The other options involve adding or subtracting from the ATA value or using a different factor, which does not accurately represent the direct relationship between atmospheres and mmHg. Therefore, the most straightforward and correct method is to directly multiply by 760 mmHg for a proper conversion.