Theory is subsequent to the collection of data or facts about the world, even when the data are being used to test theoretically derived hypotheses.

TS can be derived theoretically for simple targets such as spheres and cylinders, but in practice, it is usually measured empirically or calculated with numerical models.

All powers of the Imperator and the Pharaoh are theoretically derived from the Assembly, including their right to vote within the Assembly.

The law was derived theoretically by Ludwig Boltzmann in 1884.

Some driving cycles are derived theoretically, as it is preferred in the European Union, whereas others are direct measurements of a driving pattern deemed representative.

For simple impeller systems, NPSH can be derived theoretically, but very often it is determined empirically.

However, the value of the lattice energy may either be derived theoretically from electrostatics or from a thermodynamic cycling reaction, the so-called Born-Haber cycle.

Recently this formula was derived theoretically using the phenomenological theory of turbulence.

A number of theoretically derived stage models of normal grief have been proposed.

These authors reviewed previous attempts to measure computer self-efficacy and theoretically derived a 10 item scale.