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.
Faxing a document can be difficult if you don't understand the machine. However, once you learn to properly fax documents, you will realize how simple the process really is. In order to begin, you will need to have the fax number of the person or company to whom you are sending the document(s). 1  Make sure the fax machine is stocked with paper. 2  Place your documents face down in the tray atop the fax machine. 3  Enter the number of the intended recipient.  Press the fax button.