Newton's law of cooling — a TI-84 Plus CE program

By E-Code · updated 2026-09-26

COOL is a TI-BASIC program for the TI-84 Plus CE. Exact cooling curve versus Euler steps, plus the live rate (nDeriv), the average (fnInt) and the time to a target.

How it's checked

It is checked by E-Code's engineering suite: scripted runs on the TI-BASIC interpreter whose expected numbers were worked out separately in Python. It has no oracle case file, so this page gives no case count.

How E-Code checks every program

Run it or put it on your calculator

• Open the library in the TI-84 Plus CE calculator and pick “Newton's law of cooling” (COOL).
• Put it on your own calculator with a computer and a USB cable, or type it in by hand.

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All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs