Sometimes the temperature does not decrease with height in the troposphere, but increases. Such a situation is known as a temperature inversion. Temperature inversions limit or prevent the vertical mixing of air.
Middle range machines can cost on average $400 and are often multi-function with copier and laser printer capabilities. Finally, high-end machines which offer high speeds, high capacity and high resolution come at a higher price-expect to pay $1000 - $2500 for such a fax machine.
Confidence votes 761. Fax machine uses a phone line to transmit a copy or image of important documents such as forms, receipts, contract and any legal documents. With the rise of the internet fax technology, where documents runs over internet, you can send and receive faxes without having a dedicated phone line.