What is the accuracy of measurement when a pressure gauge reads 25 psi and the manufacturer lists accuracy as ±1% of reading?

To determine the accuracy of the measurement when a pressure gauge reads 25 psi with an accuracy rating of ±1% of the reading, you must first calculate what 1% of 25 psi is.

1% of 25 psi is calculated as follows:

[

1% , \text{of} , 25 , \text{psi} = 0.01 \times 25 , \text{psi} = 0.25 , \text{psi}.

]

Thus, the accuracy of the gauge is ±0.25 psi. This means that when the gauge reads 25 psi, the true pressure could actually be between 24.75 psi and 25.25 psi. This calculation shows that the each attempt to measure pressure has a potential error or variation of a quarter of a psi, affirming that the precision of the gauge is well-defined.

This detail demonstrates that the correct answer reflects a direct calculation derived from the manufacturer's specifications regarding the accuracy of the gauge based on the specific reading obtained.