Coke ovens in steel plant are heated by________?

Which of the following is the hardest material?

Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ρ = specific weight of the gas)?

A fuel with high heat release rate will________?

The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the________?

P2O5 content in superphosphate is about ________ percent?