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what is grade?
in Engg. Materials by  

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Grade is the rank or the quality of material .We define concrete grade and steel grade in structure design.
C30 means the concrete has (4350psi) in strength.So also in steel.Steel grade 40 means it has (4000 psi) in strength.
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grade is perecentage exprestion of slope , actual devation from normal ground level change of vertical to change if horzontal.
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