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).
So you can expect to pay in the $150 to $400 range for a yearâs supply of contact lenses. Your eye exam and cleaning solution may be extra expenses. Finally, some insurance plans cover some of the costs of contact lenses, so it is worth finding out the specific benefits offered by your health plan.