(a) Suppose that you have pits of roughly 0.002 mm diameter in a metallic heater surface.
At about what temperature might you expect water to boil on that surface if the pressure is 20 atm.
(b) Measurements have shown that water at atmospheric pressure can be superheated about 200?C above its normal boiling point. Roughly how large an embryonic bubble would be needed to trigger nucleation in water in such a state.