# Tag Info

### What was the motivation behind suggesting the trichromatic theory of vision?

The hidden meaning of a "normal range of colors" in my brain suggests that there is no normal. It is rather a "mean" or average response of the collective "us." Our ...
1 vote

### How can we define a "free energy" for a protein configuration?

As a macromolecule, a protein can adopt many configurations, and each configuration is characterized by an energy that depends on the local interactions. Therefore we have a canonical ensemble of ...
• 1,055

### Conflicting result for velocity and radius in physiology

When you conclude from $V=Q / A$ that $V$ is proportional to $r^{-2}$ you are implicitly assuming that $Q$ is independent of $A$ and $r$, which is incorrect. Poiseuille’s law tells us that $Q$ is ...
• 35.5k

### Why the pressure of atmosphere doesn't crush you when you e.g. walk outside?

Pressure acts in all directions. it does not care about direction. pressure is a property of the fluid itself. but the way you CALCULATE it is to find the 'weight of the air above'. this does not mean ...
• 111

### Why must all reactions be reversible according to thermodynamics?

In thermodynamics equilibrium is understood where all the relaxation processes that are fast in the time scale of interest have already ended, whereas the slow processes are too slow to produce ...
• 40.8k
Accepted

### Why must all reactions be reversible according to thermodynamics?

Edit: To avoid confusion, the authors aren’t referring to thermodynamic reversibility (i.e., zero entropy generation). This never occurs in real life. They’re referring to whether a strongly ...
• 14.5k