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.
The value of a countryâs currency is often judged by weighing it against other countriesâ currencies. When one country decides to lower the value of its monetary units, this is known as currency devaluation.As a result, stronger currencies are capable of buying more of the weaker currency.he value of a countryâs currency is often judged by weighing it against other countriesâ currencies. When one country decides to lower the value of its monetary units, this is known as currency devaluation.