The units are not dimensionally equivalent. The first (1.25 sq ft) is area, which is 2 dimensional. The second (8 cubic feet) is volume, which is 3 dimensional. Now you could have a box, which has a 1.25 square foot base, and is 6.4 feet tall, and that box would have a volume of 8 cubic feet.
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To convert cubic feet to kilograms, you need the density of the substance in question. Without that information, it is not possible to provide an accurate conversion from cubic feet to kilograms.
115 cubic meters is equivalent to a volume of about 115,000 liters, or roughly the size of a small swimming pool. It would fill a space measuring 5 meters in length, 5 meters in width, and 4.6 meters in height.
The average weight of iron per cubic meter is 2500 kilograms. Therefore 46 cubic meters of iron equal to 115 tons in mass (115 000 kilograms). However, the density of iron varies. There are conversion tables on internet. If you know the density of ore-iron it will become easier to find out the volume to mass ratio more accurately.
You would need 138 tiles to cover 115 square feet with 12-inch tiles. To calculate this, divide the total square footage (115) by the area of one tile (1 square foot for a 12-inch tile). So, 115 (sq ft) / 1 (sq ft per tile) = 115 tiles.
115 centimeters is = to 3.77 feet or 3 feet and 9.2 inches