Agreement - the meaning of which is uncertain (Section 29): An agreement, the meaning of which is not certain, is void, but where the meaning thereof is capable of being made certain, the agreement is valid. For example, A agrees to sell B “a hundred tons of oil”. There is nothing whatever to show what kind of oil was intended. The agreement is void for uncertainty. But the agreement would be valid if A was dealer only in coconut oil; because in such a case its meaning would be capable of being made certain.