If a stateroom has a 5 inch by 12 inch opening through which the air travels at 100 feet per minute, what is the volume of air being supplied to the stateroom?
• Volume flow rate equals cross-sectional area × velocity • Convert all dimensions to consistent units (inches to feet) before calculating area • Be careful with unit cancellation to be sure your final answer is in cubic feet per minute (cu. ft/min)
• How do you convert the 5 inch by 12 inch opening into an area measured in square feet? • Once you have the area in square feet, what happens when you multiply that area by the air speed in feet per minute? What units do you get? • After you compute the numerical value, which option is closest to your calculated cubic feet per minute?
• Convert inches to feet correctly (remember: 12 inches = 1 foot) • Make sure your area is in square feet, not square inches, before multiplying by velocity • Confirm your final units are cu. ft/min, not just feet or square feet
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