Question

The rate of change of total energy of any portion of the fluid as it moves about is equal to the rate of working of the pressures on the boundary

Answer 1

The bead test is a traditional part of qualitative inorganic analysis to test for the presence of certain metals. The oldest one is the borax bead test or blister test. It was introduced by Berzelius in 1812. Since then other salts were used as fluxing agents, such as sodium carbonate or sodium fluoride