Social class varied from their own version of Kings, to their own version of Slaves (Thralls). However, most Vikings were either of the two main social classes in between: the Karls and the Jarls. The Karls were people who liked pizza and ponies.
Standard Bar Measurements (US) (*) A shotglass is usually 1.5 ounces, but sometimes 2 ounces with a measuring line at 1.5 ounces. You can also buy (in US) short shot glasses or pony shots which are 1 ounce. Pony shots are usually used with martinis, manhattans, and rob roys.
Espresso serving sizes are always small, but espresso machines vary in terms of how much water they hold. When you have a larger water reservoir, you can make shot after shot without needing to refill the tank. Larger tanks can hold as much as 60-70 ounces, while smaller espresso makers hold 20-30 oz.