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Results tagged with metric-tensor
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user 101884
The variables used in general relativity to describe the shape of spacetime. If your question is about metric units, use the tag "units", and/or "si-units" if it is about the SI system specifically.
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Why is the stress tensor contravariant?
The stress tensor relates the traction $\vec{t}$ (force per area) on a surface with surface normal $\vec{n}$ usually written as (when disregarding co- and contravariance)
$$ t_j = \sigma_{ij} n_i.$$
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