What are the units pressure can be measured in?

The correct choice includes a comprehensive list of units commonly used to measure pressure in various scientific and medical contexts. Millimeters of mercury (mm Hg), atmospheres (atm), pounds per square inch (lb/in² or psi), pascals (Pa), and kilopascals (kPa) are all widely accepted measures.

Millimeters of mercury is a traditional unit often used in medicine, particularly for blood pressure. Atmospheres are commonly used in both laboratory and clinical settings. Pounds per square inch is often used in engineering and mechanical applications. Pascals and kilopascals are standard units in the International System of Units (SI) and are used in various scientific measurements due to their versatility and consistency in expressing pressure.

Other options may include some correct units but do not provide the same breadth or include less conventional measures that are not as commonly applied in medical contexts. For instance, degrees Celsius is a temperature unit and not related to pressure measurement, which would not fit the context of this question. The inclusion of both traditional and SI units in the correct answer allows for a greater understanding and applicability to different fields, particularly in medicine and engineering.