One of the physical properties of fuels that is relevant to use in a combustion engine is viscosity.1 the viscosities of diesel, biodiesel, and vegetable oil are very different from eachother. a. why is viscosity an important property in this context?

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference