The teacher demonstrates an experiment to the students to show that Water boils at low temperature under low pressure. He takes the flask and fills it half with the water. Boils the water, and remove the flame. Closes flask and inverts it and pour cold water on the flask. The students observe the process carefully and see that water has begun to boil again when cold water is poured on the bottom of the inverted flask. During the task students asked various questions like:

a) Why is the water boiling?

b) Why did the water boil first?

c) Why was the flask closed and then inverted?

d) Why was cold water poured over the bottom of the inverted flask?

e) Why did the water boil in the flask when cold water is poured over the inverted flask?

At which step of the scientific method do these students have?