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.
Foreign Currency. It is a good idea to have some foreign currency with you before you leave the U.S., to cover immediate expenses such as taxis, meals, or tips. You can avoid the hassle of exchanging currency upon arrival as some airports and train stations don't have exchange offices, or could be closed when you arrive. Foreign currency is available for over 100 countries, with over 70 currencies available through our online order site.