askpari ♦ December 19, 2012 ♦ Leave a comment
To skywrite, the pilot releases smoke-making chemicals into the airplane’s exhaust pipe. The trail of smoke they produce traces the letters. Skywriting is a method of writing in the sky with an airplane. A trail of smoke traces the letters. Most skywriting message are advertisements that promote products advertisers want to sell. The smoke used …
askpari ♦ October 15, 2009 ♦ Leave a comment
We’ve all see smoke rising from a bonfire or the chimneys of factories and houses. When a log in a fireplace burns, some of the burning wood is changed into invisible gases. These hot gases, which consist mostly of water vapor and carbon dioxide. Are very light. They rise up the chimney and drift away …
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