What is the difference between the dissolution of a partnership and the liquidation of partnership property?

1-What is the difference between the dissolution of a partnership and the liquidation of partnership property? After liquidating all property and paying partnership obligations, what is the basis for allocating remaining cash among the partners?

2-When a partner withdraws from a partnership, why is the final distribution often based on the appraised value of the business rather than on the book value of the capital account balance?