Two technicians are describing the process to determine the API number of a diesel fuel. Technician A says that you use a specific diesel fuel hydrometer to measure the fuel's temperature and API number. Technician B says that because the density of a fuel is affected by temperature, the corrected API value provides the API number that the fuel would have at room temperature. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct that a hydrometer is used to measure the API gravity of diesel fuel. Technician B is also correct that the API gravity is temperature-corrected to provide a standard value at a reference temperature.

Two Technicians Are Describing the Process to Determine the API