Do you know how to work out the weight of steel plate?

Length x Breadth x thickness x 7.85 (Specific material density for Mild Steel)
1 metre x .5 metre x 6mm x 7.85 = 23.5 kilograms
1 metre x 1 metre x 10mm x 7.85 = 78.5 kilograms
6 meters x 3 meters x 20 mm x 7.85 = 2,826 kilograms.

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SomeMichGuy · M

No.

1) You calculated mass, not weight. To obtain the weight, you have to multiply by the acceleration due to gravity...if any.

2) This is not only applicable to (mild) steel plates.

3) Are you suggesting that it is a surprise that, since the mass density, ρ, is defined to be

ρ = (dm/dτ)

where dτ is a differential volume element, leads to

M = \int_{0}^{M} dm
= \int_{0}^{V} ρ dτ

for finding the total mass M in a volume V of a substance with a given ρ...?