At sea level, what is 0 Psig equivalent to?

At sea level, 0 psig (pounds per square inch gauge) is equivalent to 14.7 psi. This is because psig measures pressure relative to atmospheric pressure; therefore, at sea level, the atmospheric pressure is 14.7 psi. When using gauge pressure, 0 psig indicates that the pressure being measured is equal to atmospheric pressure, which is why it directly correlates to the value of 14.7 psi at sea level.

Understanding this context is crucial in fields like refrigeration, where pressure measurements impact the operation and efficiency of refrigeration systems. The other values listed, such as mmHg, kPa, and atm, while related to pressure, do not represent the correct equivalent under the given conditions when referencing 0 psig.