What causes that liquid effect on asphalt on hot days? - FMVperformance.com : The site for all your Ford Mazda and Volvo needs
 
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post #1 of 9 (permalink) Old 07-15-2006, 05:32 PM Thread Starter
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What causes that liquid effect on asphalt on hot days?

You have all seen it, on really hot and sunny days, when you see a car coming from far away and it looks like the ground is all wet and you can see a feint reflection of the car off the pavement.

what is this caused by?
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post #2 of 9 (permalink) Old 07-15-2006, 05:35 PM
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Re: What causes that liquid effect on asphalt on hot days?

that is the heat rising off the ground...look at a camp fire or when you 1st open a hot over. There is waves. That is just the heat rising. And when you look down the street, your looking at, at least 20 feet of hot pavement so all the heat in the 20+ feet is the heat rising up.


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post #3 of 9 (permalink) Old 07-15-2006, 05:35 PM
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Re: What causes that liquid effect on asphalt on hot days?

... you mean a mirage?
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post #4 of 9 (permalink) Old 07-15-2006, 05:36 PM
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Re: What causes that liquid effect on asphalt on hot days?

thats why you tend not to see it on concrete because concrete doesn't attrach the heat as good as black pavement. When it's hazy outside...thats from heat and mostiure combined and it dissortes the horizin because of all the air movement


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post #5 of 9 (permalink) Old 07-15-2006, 05:37 PM
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Re: What causes that liquid effect on asphalt on hot days?

[quote author=Say Chi Sin Lo link=topic=51597.msg825670#msg825670 date=1152999335]
... you mean a mirage?
[/quote]

That is when your in a desert and the heat looks like water, but yes


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post #6 of 9 (permalink) Old 07-15-2006, 05:39 PM Thread Starter
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Re: What causes that liquid effect on asphalt on hot days?

interesting
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post #7 of 9 (permalink) Old 07-15-2006, 05:42 PM
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Re: What causes that liquid effect on asphalt on hot days?

get a torch lighter or a regual lighter, get a lamp and shine it at the wall. light the lighter between the wall and the lamp and look at the shadow on the wall. You will see the "waves"


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post #8 of 9 (permalink) Old 07-15-2006, 06:10 PM
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Re: What causes that liquid effect on asphalt on hot days?

the layer of hot air right next to the pavement has a lower index of refraction, creating a total internal reflection at grazing incidence. The reflective property is what makes it look like water.

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post #9 of 9 (permalink) Old 07-17-2006, 09:23 AM
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Re: What causes that liquid effect on asphalt on hot days?

[quote author=root link=topic=51597.msg825694#msg825694 date=1153001413]
the layer of hot air right next to the pavement has a lower index of refraction, creating a total internal reflection at grazing incidence.* The reflective property is what makes it look like water.
[/quote]

^
||
||

There is the explination. Light slows down or speeds up in higher or lower density air so it bends the light. The above occurs. Same thing with desert mirages. It is basically heat shimmer at the right angle to cause this. You can see heat shimmer off anything particularly hotter then the surrounding air. Look at a cars exhaust on a cool day or a jet engine, campfire, etc.
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