The normal stress is the same in all directions at a point in a fluid, only when the fluid________?

Among liquids, water has a comparatively high value of thermal conductivity, due to its________?

For a ________ order reaction, the units of rate constant and rate of reaction are the same?

The substance used as a smoke screen in warfare is________?

Pick out the wrong statement?

The function of an economiser in a boiler is to preheat the ________?