Super conduction in metals is observed at a temperature of ________ °K?

Inhalation of silica dust causes a disease called________?

A solution with reasonably permanent pH is called a/an ________ solution?

If more than two branches of pipes are to be connected at the same point, then use a/an________?

The new nucleus formed after β-decay of a radioactive element has________?

Very high pressure boilers are usually ________ boilers?