Recall that the reference sensation of touching ice is used to calibrate the measurement of temperature. So to make good measurements we are getting more precise about what we mean by *ice*. Accordingly, here is a definition of temperature that is tied to the triple point of water. The **thermodynamic temperature** is defined by

where is the Celsius temperature. In the following discussion, the symbol refers to the thermodynamic temperature, in units called *kelvins*, noted by (K).

Quarks are conserved but compound quarks may decay. Their stability is characterized by a number called the *mean-life*. Let particle P be described by its thermodynamic temperature . The **mean life** of P is defined as

where is the exponential function and the constant seconds. Customarily, if P is an atom of hydrogen in its ground-state, then and , so this constant is called the *mean-life of hydrogen*^{1}For more detail, see the discussion of stability in the article about atomic hydrogen.. A particle with a negative temperature supposedly has a longer mean-life than hydrogen. But for EthnoPhysics, the only particles like this are some quarks and field quanta which are not given space-time descriptions. All models of observed nuclear particles have a positive thermodynamic temperature. Particle stability is also characterized by a number called the **full width** which is noted by and defined as

The total number of any specific type of thermodynamic quark does not vary if ordinary-quarks are swapped with anti-quarks of the same type. And with the assumption of conjugate symmetry both kinds of quarks have the same temperature. So

Particles and their associated anti-particles have the same mean-life and full-width. Next we consider a special nuclear particle, the proton.

1 | For more detail, see the discussion of stability in the article about atomic hydrogen. |
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