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2007-01-05 15:50:54 · 7 answers · asked by flah10 2 in Science & Mathematics Other - Science

7 answers

Because the material is back

2007-01-05 15:56:53 · answer #1 · answered by BB2791 4 · 1 1

First kevinthen. Tires are not a good conductor of electricity. They are a much better insulator than air is. Lightning has a high enough voltage to travel miles through air to strike a target. Like a car for example. That same voltage allows it to jump from the car to the ground through the air. Even through tires if the lightening so chooses. The faraday cage effect is exactly correct in that it is the reason people inside the car do not get fried if a car is struck by lightning. google faraday cage if you want to see how that works.

Now back to the question at hand. Tires are in fact black because of material called "carbon black" that is added to most tires. Carbon black is added to improve strength, lifetime and treadwear. There are exceptions. There are "green tires" that use fumed silica as a filler and strengther instead of carbon black. Some actually have a green hue.

Carbon black is essentially fumed soot that has a particular shape and size to it depending on the application. It is very very black fine powder. Definitely black. Similar to toner for a copy machine. google "carbon black" for more info.

One other thing. Carbon black is not graphite. graphite has a definite flat crystalline structure. works as a dry lubricant by allowing crystals to slide over one another in an almost frictionless way. Carbon black is amorphous (ie. non crystalline) and it is 3d. It strengthens rubber by adding structure to the system.

2007-01-06 14:08:01 · answer #2 · answered by Dr W 7 · 2 0

When tires were first developed they were always white. In fact, vulcanized rubber is natively white. Goodyear recognized that adding carbon to the mixture greatly extended the life and enhanced the grip of the tire without adding significantly to the cost. Now all tires are manufactured with carbon black added in a resinous mixture. White walls used to really be white - now, "white walls" refer to painted lines on the outside face of the tire that is often coated in blue to protect the painted finish - which must be washed before the white will show. Almost no "white walls" are left on the market, anyway. Hope this helps.

2007-01-05 23:57:01 · answer #3 · answered by sckuperman 2 · 3 0

This has already been said, but Carbon is your reason. Carbon is black in its graphite form. Carbon is the reason why tires are relatively good conductors of electricity when lighting strikes the car, effectively grounding the chassis for the Faraday cage effect to work properly.

2007-01-05 23:59:52 · answer #4 · answered by kevinthenerd 3 · 0 1

Even if there white,pink, and color there prett y much going to be black anyways and its basicly the matirial if you painted it the tire would crack

2007-01-05 23:53:31 · answer #5 · answered by Anonymous · 0 0

If you've ever tried to keep whitewall tires clean, you would know.

2007-01-05 23:54:10 · answer #6 · answered by ? 6 · 0 0

That's a racist question.

2007-01-05 23:52:06 · answer #7 · answered by marklemoore 6 · 2 0

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