Hydrogen content in petroleum products varies from 12 to 15% (by weight). As a result the difference between gross and net heating value of petroleum fuels varies in the range of ________ kcal/kg?

What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers?

Beyond what concentration of H2S in air, acute danger to human life exists?

________ decreases during adiabatic throttling of a perfect gas?

Soaps remove dirt by ________?

Maximum stability of white phosphorous is at________?