Sigma

Science / Marine Biology / Sigma: Parameter expressing the seawater density: and equal to 1 minus the density of seawater, measured at a given temperature and at a pressure of l atmosphere

Sigma Bond

Science / Chemistry / Sigma Bond: In the valence bond theory, a sigma bond is a valence bond that is symmetrical around the imaginary line between the bonded atoms. Most single bonds are sigma bonds. MORE

Six Sigma

Business / Human Resources (HR) / Six Sigma: Six Sigma is a disciplined, data-driven methodology used to eliminate defects and improve processes and cut costs from manufacturing to transactional and from product to service. MORE

Sigma-T (Ft)

Science / Tides and Currents / Sigma-T (Ft): An expression of density as a function of temperature and salinity (at atmospheric pressure) in a convenient numerical form. See density. Ft = (Ds,t,p – 1)1,000 MORE

Sigma-Zero (Fo)

Science / Tides and Currents / Sigma-Zero (Fo): An expression of density as a function of salinity (at atmospheric pressure and 0°C) in a convenient numerical form. See density. Fo = (Ds,t,o – 1)1,000 MORE

Pi Bond

Science / Chemistry / Pi Bond: In the valence bond theory, a pi bond is a valence bond formed by side-by-side overlap of p orbitals on two bonded atoms. In most multiple bonds, the first bond is a sigma bond and all of the others a MORE

Triple Bond

Science / Chemistry / Triple Bond: A covalent bond that involves 3 bonding pairs. In the valence bond theory, one of the bonds in a triple bond is a sigma bond and the other two are pi bonds. For example, the central bond in acetylene MORE

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