A pressure reading of 14.7 psi is equivalent to what?

A pressure reading of 14.7 psi represents atmospheric pressure at sea level, which is commonly referred to as gauge pressure. When converting from absolute pressure to gauge pressure, the atmospheric pressure is subtracted from the absolute reading.

In this case, 14.7 psi is the absolute pressure, which is essentially zero when considered in relation to gauge pressure. Gauge pressure measures the pressure relative to the surrounding atmospheric pressure. Therefore, when you subtract 14.7 psi (the atmospheric pressure) from itself, you are left with 0 psig. This indicates that there is no additional pressure above atmospheric pressure.

Understanding this concept is essential for interpreting pressure readings in various applications, ensuring accurate measurements and safe operations in systems that involve gas.