How is the number of ounces sprayed calculated in the compressed air sprayer calibration?

• A. Subtract the ounces left in the sprayer from the 64 ounces originally added
• B. Measure the spray pattern width
• C. Multiply 64 by the area sprayed
• D. Count droplets sprayed

Answer: (A)

In calibrating a compressed air sprayer, you determine how much liquid was dispensed by comparing the starting volume to what’s left after spraying. You fill the sprayer to a known amount, typically 64 ounces, then spray for your test. After finishing, measure how many ounces remain. Subtract the remaining amount from the starting amount. The difference is the ounces sprayed. For example, if you started with 64 oz and 22 oz are left, you used 42 oz.

This method gives a direct, verifiable measure of output. The other ideas don’t quantify volume: measuring spray pattern width checks coverage area, not volume; multiplying 64 by the area sprayed assumes a specific, known relationship between area and volume that isn’t actually given; and counting droplets isn’t a reliable way to determine exact ounces sprayed.