Where did the water go? II

This task is about water that seems to disappear.
two jars with water
Tom's jar                                                   Simon's jar                  
 
Tom and Simon left their jars of water on the window sill for a week.

Question

a) After a week one jar still had 1 cm water in it but the other jar was empty.
     Whose jar was empty?

    • Tom's jar

    • Simon's jar

Question 1Change answer

b)  Where did the water go?

Question 1Change answer

c) Explain why the other jar still had water in it.