Water content (θ) is also a directly measurable property; it is the fraction of the total rock which is filled with liquid water.

The premise of the Forbes article, in examining only the directly measurable effect, is flawed.

The Thomson coefficient is unique among the three main thermoelectric coefficients because it is the only one directly measurable for individual materials.

This definition depends on vapor pressures which are a directly measurable property, at least for volatile components.

Their main advantage over other orientation descriptions is that they are directly measurable from a gimbal mounted in a vehicle.

Therefore gyros are used to know the actual orientation of moving spacecraft, and Euler angles are directly measurable.

Utility is not directly measurable, so the true cost of living index only serves as a theoretical ideal, not a practical price index formula.

The effect on retail sales is not directly measurable.

That is a directly measurable quantity.

Thus, we do not need to think of energy storage because this is not a directly measurable value.