The mass of the plate will depend on its density. To find the mass, multiply the density by the volume, which in this case is 5/3 cubic feet.?æ
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surf board
375kg/m3
A 'cubic centimetre'. If your CC is water it will weigh one gram and be one thousanth of a litre, one thousanth of a kilgram.
A queen-size mattress is 60" wide by 80" long (152 cm wide by 203 cm long). A king-size mattress is 76" wide by 80" long (193 cm wide by 203 cm long). A California king-size mattress is 72" wide by 84" long (182 cm wide by 213 cm long).
However long and wide you want to dig it.