The activation energy for the diffusion of atomic species A in metal B is 124 kJ/mol. Calculate the diffusion coefficient at 802°C, given that the value of D at 1150°C is 7.7 × 10-12 m2/s.

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