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33. The BTU value of fuel oil is determined by a/an __________.
A calorimeter directly measures the heat content (BTU) of fuel by burning a known amount and measuring the released heat. Calorimeters are instruments designed to measure the heat of combustion, expressed in BTU per unit mass or volume. Other instruments, such as open cup tests (flash point), hydrometers (specific gravity), and viscosimeters (viscosity), do not determine BTU value.
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