What are the density and physical dimensions of the solar system's asteroid paddock?

Is the asteroid field at uniform density and dimension across its diameter? What is the density inside the asteroid belt? What are the dimensions, both average and specific, of the asteroid belt?
Answers:
From what I can find in a lawfully shallow search, the asteroid belt have a very low density, as see below. Based on that, I cannot believe that it's uniform, but was not sufficiently expert to find anything one way or the other. You can find the dimensions below. The links should be a dutiful place to start if you need more information. Also, try http://www.madsci.org/ and dig out their archives for "asteroid belt." They have great science question and answers.

"Despite popular imagery, the asteroid belt is mostly unfurnished. The asteroids are spread over such a large volume that it would be notably improbable to conquer an asteroid without aiming obligingly.

"Nonetheless, tens of thousands of asteroids are currently known, and estimates of the total number continuum in the millions. About 220 of them are larger than 100 km. The biggest asteroid belt extremity is Ceres, which is about 1000 km across. The total mass of the Asteroid belt is estimated to be 3.0-3.6×1021 kilograms[1][2], which is 4% of the Earth's Moon. And of that total mass, one-third is accounted for by Ceres alone." (1)

"Known as "minor planets," tens of thousands of asteroids congregate within the so-called main asteroid belt: a infinite, doughnut-shaped ring located between the orbits of Mars and Jupiter from approximately 2 to 4 AU (186 million to 370 million miles/300 million to 600 million kilometers)."(2)

"If adjectives the materials of all the asteroids be squashed up into one planet it would be smaller than our moon." (3)

"The asteroids are so widely separated that it's easy for a spacecraft to maneuver through the belt lacking even seeing an asteroid, much less running into one." (4) (This is taken from a clause about science fiction, so the spacecraft is intangible. <s>)
I'm only writing to say-so "Thank You" for bringing this to my attention. I am an amateur Astronomer, and have other "ignored" the Astroid Belt that orbits the Sun between Mars and Jupiter. The item that's most curious to me, is as to "why" does the Astroid Belt even exist where it does. I regard as it's a curious thing contained by itself that, the Astroid Belt orbits the Sun between the inner, smaller planets of the Solar System, and afterwards outside the Astroid Belt, the "Jovian" (extremely large) bodies of mass orbit the Sun (excluding Pluto, however, which is debatable as to whether or not it can be considered a "true" PLANET of the solar system.


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