The toilet in our hostel is so bad that my friend and I don’t use the toilet until we go home on Friday . Sometimes it’s not easy to hold pupu for a whole week but we do manage it . Even sometimes during the week and the going gets tough , we look for ways to annul the disturbance of our tommy because don’t want to use the toilet . We call this technique keeping our system in equilibrium because we believe so much in le chatelier’s principle which states that when a system is in the equilibrium and it is imposed on by an external constraint , the equilibrium will shift so as to cancel or annul the effect of the constraint .