👉 The term "envapor" is often used in the context of air or water. It refers to a process where warm, moist air rises and cools down into liquid form. This can happen when there's an increase in temperature, pressure, or humidity. Envelope refers to the enclosed space or region within a larger object. For example, if you were to take a glass jar with a hole drilled through it, the air inside would be in the form of an envelope around the hole.