a unitless quantity
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A dimensionless qua Dimensionless quantity may have unit but a unitless quantity never has a dimension. For eg radian. It has no unit .Its dimension is M0l0T0.
thaheeratq:
Specific gravity and strain
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A dimensionless qua Dimensionless quantity may have unit but a unitless quantity never has a dimension. For eg radian. It has no unit .Its dimension is M0l0T0.
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