The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is________?

Buoyant force________?

Dittus-Boelter equation used for the determination of heat transfer co-efficient is valid ________?

Coke oven gas burns with a yellowish flame, because of the presence of ________?

Nuclear reactors are provided with shield to guard against the emission of mainly ________ rays?

Which one can be directly solidified from gaseous state without entering into liquid state?