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.
If you appreciate something, you recognize its value. We can all appreciate how refreshing cold lemonade is on a sweltering summer day. The oldest meaning of appreciate is to know the worth of something: The parolee appreciated his newfound freedom.. A related sense is to be grateful for something, but this usage can sound wordy. Instead of I would appreciate your sending me more information, consider: Please send me more information..