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<p>[QUOTE=&quot;Forkeh, post: 1377358, member: 31745&quot;]Measure the density. Density is mass divided by volume. Mass is weight, easy to look up. To find the volume, do a water displacement test. Get glass, it needs to be a clear glass that is a uniform cylinder. Measure the water displaced (use a ruler), and multiply that rise in water level, by the surface area of the water. Surface area of a cylinder is 2pi*r^2+2pi*r*h, where r is radius, and h is the height. You can use a ruler to find all these measurements. To find the mass of both the 40% and the 90%, use Google. &lt;br&gt;&lt;br&gt;After you&#039;ve done this, compare to a whole 40% and 90%, I wouldn&#039;t think you&#039;d be off more than fractions of units. Whatever is the closest, do it. You&#039;re not going to try and calculate the volume and mass of the missing hole....trust me it becomes a mathmatical nightmare lol. What you get from this should be close enough.</p><p><br /></p><p>Or....you could drill a hole as close as possible into another 40%er and just weight it <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie12" alt="o_O" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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