For any given substance, the heat capacity of a body is directly proportional to the amount of substance it contains (measured in terms of mass or moles or volume). Doubling the amount of substance in a body doubles its heat capacity, etc.
Conventional soft contacts can last up to a year; conventional rigid gas permeable (RGP) contact lenses can last even longer. Frequent or planned replacement contact lenses last one to several months. Disposable contacts last from one day (daily wear) to up to two weeks (extended wear).
The âcontinuous wearâ contacts, refers to the type of contacts that can be worn (depending on the type) for 2 weeks or 4 weeks continuously. There also used to be quarterly and annual lenses and even though at some point they were very common, manufacturers decided to discontinue them.