Heat explained through equations, evidence and everyday experience

What the site covers

Heat appears in physics, materials, buildings, electronics, engines, weather, cooking, the human body, Earth and space. The word also appears in experiences such as chilli burn and emotional warmth, where the science may involve sensory or physiological processes rather than a rise in physical temperature.

The site follows those differences carefully. A conduction problem needs a heat-transfer model. A chilli-pepper question needs sensory biology and chemistry. A high-altitude boiling question needs thermodynamics and atmospheric pressure. The subject changes, but the goal stays the same: explain what is actually being measured, transferred or perceived.

How calculations are built

The calculators run locally in the browser wherever practical. Core tools use established relationships such as Fourier conduction, sensible heat Q = mcΔT, thermal-resistance networks, the Stefan-Boltzmann radiation relation, latent heat Q = mL and steady energy balances. Other tools use clearly stated simplified models for areas such as geothermal gradients, gas compression, planetary radiative equilibrium and transient thermal contact.

Each calculator should make its inputs, units, equations, assumptions and limits visible. A numerical result is only as useful as the model behind it.

How reference data is handled

Thermal properties depend on material composition, temperature, pressure, moisture, density, manufacturing state and measurement method. The reference material therefore presents representative values with condition notes instead of treating every material as if it had one universal constant.

How factual information is handled

Primary and recognised technical sources take priority. These include NIST thermophysical-property references, U.S. Department of Energy building-science resources, NASA, USGS, National Weather Service guidance, NIOSH occupational-heat resources, USDA food-safety material, standards organisations and peer-reviewed research where appropriate.

The site does not invent laboratory testing, professional credentials or original research. Established methods are described as established methods, with source organisations identified so readers can examine the underlying guidance or data.

Where simplified models stop

An educational calculator cannot replace a laboratory measurement, manufacturer datasheet, building-code procedure, validated food-safety process, medical assessment or professional engineering analysis. Safety-sensitive pages state these boundaries directly and link to authoritative guidance where practical.

Corrections

Technical information deserves scrutiny. If you spot an equation, unit, source, broken link or explanation that needs correction, use the contact page and include the page URL and the specific issue.