Ice on a car windshield will disappear as you drive along, even without the heater on.
Please explain why this happens.
Thanks!
2006-09-12 09:59:39 · 7 answers · asked by Anonymously Anonymous 5 in Science & Mathematics ➔ Chemistry
This is sublimation. The frozen water is going directly into the gaseous state from the solid, without melting. Ever notice how ice cubes will wilt over time if left in the freezer? Same idea.
The reason it happens at a faster rate in the scenario you outline is because the air stream hitting the ice on the glass is dry and moving fast. Both these parameters have a enhancing influence on the process.
2006-09-12 10:06:25 · answer #1 · answered by Anonymous · 3⤊ 0⤋
Heat from friction from the air deflecting off windshield, the engine and body heat from car occupants, vibration from the road.
Do not do this on the road. The ice will disappear if it isn't thick but it will take much longer than it will take to get in an accident.
2006-09-12 17:04:22 · answer #2 · answered by Kuji 7 · 1⤊ 0⤋
because when u drive the wind pushes it so some fall off or if a little heat is in the wind it melts.
2006-09-12 17:01:20 · answer #3 · answered by yo!!!!! 3 · 0⤊ 1⤋
Well, they are right, but, it takes a long time, and, with your vision even partially obscured, you could get into a bad accident and never have to worry about that again.
2006-09-12 17:05:04 · answer #4 · answered by chuckufarley2a 6 · 0⤊ 1⤋
friction of the air hitting the windsheild. the friction turns to heat and it eventually turns the ice to water and it evaporetes off.
D.
2006-09-12 17:07:07 · answer #5 · answered by Dan S 6 · 1⤊ 1⤋
because the heat from your engine melts it off
2006-09-12 17:00:32 · answer #6 · answered by pittisit43 4 · 0⤊ 1⤋
you should scrape it anyway........
2006-09-12 17:05:02 · answer #7 · answered by myheartisjames 5 · 0⤊ 1⤋