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One-page interective animation (Flash) explaining how to estimate O2 consumption from Minute Ventilation (measured) and O2 concentration in expired air (measured). The Physiology lab procedure "Metabolic rate measurement" is based on this principle. Measurement of the rate of oxygen consumption provides a simple, versatile and powerful tool for estimating the rate of heat release in fire experiments and fire tests. The method is based on the generalization that the heats of combustion per unit of oxygen consumed are approximately the same for most fuels commonly encountered in fires.