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Answer :
Final answer:
(b) 76 cm of Hg, The correct answer is '76 cm of Hg'. This is because standard atmospheric pressure can support a column of mercury that is approximately 76 cm high, hence, it's a common measure of atmospheric pressure.
Explanation:
The question is asking for the normal atmospheric pressure. Normal atmospheric pressure is officially defined as 101.325 kilopascal (kPa). However, it can also be measured with various units due to the usage of different measurement tools. Among the options you've provided, the correct one is (b) 76 cm of Hg. This is because atmospheric pressure is often measured with a barometer, which utilizes the height of a column of mercury to indicate pressure. The standard atmospheric pressure can support a column of mercury that is approximately 76 cm high, thus we often say that the atmospheric pressure is '76 cm of Hg'. Keep in mind, this is equivalent to 101.325 kPa, or around 1 atmosphere (atm).
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