NavierStokes equation or NavierStokes equations
Which is correct, "NavierStokes equation" or "NavierStokes equations?"
There is a large number of people who use plural form for this equation. With regard to "energy equation," most people use singular form. Does anyone know the reason? :confused: 
The "NavierStokes equations" are 3 equations, one for each momentum component. Some people also use this term to indicate the 3 momentum equations + the energy equation

Dear sbaffini,
Thank you for your prompt reply. I understand the reason. 
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