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.
They may ask you for the fax destination number (the area code is key) before calculating the price. If youâd rather not head out to your local copy shop, the online fax service FaxZero.com will let you send a 15-page fax from your computer to anywhere in the U.S. for a flat $1.99.