When the average kinetic energy of the molecules goes up (a rise in temperature), the average speed of the molecules increases. And lower average kinetic energy of the molecules means they have lower speed. However, a change in average kinetic energy is not directly proportional to a change in average speed. 1.
An appreciation means an increase in the value of a currency. It means a currency is worth more in terms of foreign currency.
Investopedia explains Present Value (PV). This may sound confusing, but it really is not. The basic idea is that receiving $1,000 now is worth more than receiving $1,000 five years from now, because a person who has money today can invest it and receive an additional return over the five years.resent value of money is important in calculating bond yields, the value of annuities, and many other transactions. It is also used in comparing the value of two amounts of money existing in different times.