To determine the actual flow rates — the number of “buckets” — I must first do a heat-loss analysis to calculate how many BTUs I need. Then I can plug that BTU figure into a flow-rate formula to ...

Anthony Rowett Jr. explains how to select the proper diameter hose and nozzle size, based on fire flow formulas, for initial fire attack.

The peak expiratory flow rate test measures how fast a person can exhale. It is commonly performed at home with a device called a peak flow monitor.