Environmental simulation is used to determine a product's ability to perform during or after exposure to a specific environment. These tests are often used to prove a product's integrity, verify manufacturer's claims regarding operational limits, determine realistic warranty terms, and prepare procedures on proper and safe operation. Many components and products are general in use, as well as highly portable. Therefore, a variety of different environments may be encountered by an item in its expected lifetime. Simulations of high temperatures and high humidity's may be alternated with cold and dry atmospheres. A product may be exposed to oily, dusty conditions, or intense sunshine. Operation may be required in an explosive atmosphere or at high altitude, up to and including space station altitudes and conditions. Many other conditions or combinations can be created depending on the expected use of the product.