Science A student researches the use of a pressure cooker to cook foods quickly at temperatures above the normal boiling point of water.
a. How could you use a particle model to describe why the pressure in a sealed pressure cooker increases as the water is heated.

They can measure  the amount of energy gained or lost

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.