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.
How to Send a Document to a Fax Number. There are multiple ways to send faxes today. Computer fax applications can make sending a fax easier and faster than the traditional fax machine. However, fax machines are still in wide use today, both on the receiving and sending end. You can also use online fax services to send faxes.