In the atmospheric pressure calculation, Cal and Act stand for?

• A. Calibrated Value; Actual Value
• B. Calibrated Value; Activity Value
• C. Calibrated Volume; Actual Volume
• D. Calibration; Activation

Answer: (A)

In atmospheric pressure calculations, Cal and Act stand for Calibrated Value and Actual Value. The calibrated value is the sensor’s reading after applying calibration adjustments to correct for bias, drift, and scale factors, so it more accurately reflects the true pressure. The actual value represents the true atmospheric pressure at the measurement moment, the value you would get from an ideal, perfectly accurate instrument.

Using the calibrated value in calculations helps ensure the results reflect real conditions rather than instrument imperfections. The other terms—such as a value related to volume, or generic words like calibration or activation—don’t describe two specific quantities used together in this calculation, so they don’t fit the context.