That's almost double what most of us actually consume. Potassium is found in a wide range of foods, especially fruits and vegetables such as leafy greens, tomatoes, cucumbers, zucchini, eggplant, pumpkins, potatoes, carrots and beans. It's also found in dairy foods, meat, poultry, fish and nuts.
Definition of rack. 1  1 : a framework for holding fodder for livestock. 2  2 : an instrument of torture on which a body is stretched. 3  3a (1) : a cause of anguish or pain (2) : acute sufferingb : the action of straining or wrenching.  4 : a framework, stand, or grating on or in which articles are placed.
Rack Basics. Rack is a kind of middleware. It sits between your web application and the web server. It handles all of the server-specific API calls, passes on the HTTP request and all the environment parameters in a hash, and gives your applicationâs response back to the server.