Often between 5 and 15 meters.
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If you mean what units, that would be meters.
SI UNIT Usually, at a normal classroom size, the tool to use would probably be to measure it in either yards or meters. TOOL A yard stick
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An approximate volume can be calculated by assuming the classroom is a cuboid (which it nearly is, except for windows, doorposts, etc) and measuring its length, its width and its height and multiplying the three lengths together. For a more accurate value, measure the largest cuboid that would fit in the room, calculate its volume and then add on the volume of every little nook and cranny of the classroom (by measuring them and calculating their volume).
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