Question

what is therta and sigma​

Answer 1

Answer:

Is Theta Sigma the Doctor's real name? Theta Sigma was the Doctor's unique nickname when he was studying at the Time Lord Academy on Gallifrey. Although this identified the Doctor from all the other Time Lords at the academy, the Seventh Doctor (Sylvester McCoy) dismisses it as just a nickname in The Happiness Patrol

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Answer 2

Answer:

Used in physical oceanography, symbol σθ.) The density ρ (<1000 kg m−3) that a parcel of water of salinity S and temperature T would have if it were raised adiabatically to the sea surface, where its temperature would change from T to potential temperature θ due to adiabatic decompression.

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