depression definition. A period of drastic decline in the national economy, characterized by decreasing business activity, falling prices, and unemployment. The best known of such periods is the Great Depression, which occurred in the 1930s.
A variometer â also known as a rate of climb and descent indicator (RCDI), rate-of-climb indicator, vertical speed indicator (VSI), or vertical velocity indicator (VVI) â is one of the flight instruments in an aircraft used to inform the pilot of the rate of descent or climb.
Velocity is a vector quantity, the rate at which an object changes it's position. The speed calculation formula is: Speed = Distance / Time. Speed unit in SI system is meters per second (mps). Other common units are miles per hour (mph) and kilometers per hour (kph). How to use the converter? 1) Enter a valid value into text box below, default is 1.