Any mild perception of heat that happens in routine human activity is called a safe thermal sensation. Safe thermal sensations are described using words like warm, cool, balmy, chilly and lukewarm. They are similar to the temperature of a living person. The reference experience for a safe thermal sensation is touching steam. So to make a binary description of a safe thermal sensation, compare it to touching steam. Report the result using one of the following algebraic statements. If the two experiences are not comparable, then say that the sensation is not a safe thermal sensation and express this as $\delta_{\tau}=0$. If the sensation is like touching steam, then say that it is warm. Express this as $\delta_{\tau}=+1$. If the sensation is not like touching steam, then say that it is cool and that $\delta_{\tau}=-1$. The number $\delta_{\tau}$ is called the warmness.

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favicon.jpeg Touching Steam
Adjective Definition
Warmness $\delta_{\tau} \equiv \begin{cases} +1 &\sf{\text{if a thermal sensation is warm }} \\ \; \; 0 &\sf{\text{if a sensation is not thermally safe }} \\ -1 &\sf{\text{if a thermal sensation is cool }} \end{cases}$ 2-6
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