A magnet can change character when heated
A magnet’s response is not controlled only by how much material it contains. Temperature matters too. Pierre Curie compares diamagnetic materials, weakly magnetic materials and ferromagnets such as iron. Diamagnetic materials weakly oppose an applied field; paramagnetic materials are weakly attracted, while ferromagnets can show strong magnetization. His question is whether changing temperature can connect these behaviours. Instead of beginning with a microscopic explanation, the work measures patterns that a later explanation must account for, including places where a simple pattern fails.
A coefficient tells you how strongly a material responds
Within a suitable weak-field regime, a magnetic coefficient relates magnetization to the applied field. Curie finds an approximately inverse relationship between this coefficient and absolute temperature for several weakly magnetic substances. Absolute temperature is measured in kelvin. The original also discusses material exceptions and a possible additional diamagnetic contribution. A useful law therefore comes with a material and measurement regime; it is not a formula that every magnetic object obeys at every temperature.
Try the inverse-temperature model
Here is an invented classroom model, not a measurement from the thesis. Suppose a coefficient is C divided by T, where C equals 12 in chosen teaching units. At 300 kelvin the coefficient is 0.04; at 600 kelvin it is 0.02. Doubling absolute temperature halves this model’s response. Those temperatures are 26.85 and 326.85 degrees Celsius. Doubling a Celsius reading is a different operation, which is why the scale and units belong beside the claim.
The transformation region needs its own explanation
Ferromagnets behave differently near their magnetic transformation temperature. The original thesis explains that inverse-temperature behaviour can emerge as a limiting pattern sufficiently far above that region, rather than applying the same approximation through the transition. Its reported historical temperatures should remain identifiable as historical measurements. Later Curie-Weiss descriptions and microscopic theories are separate developments. Awarding credit to this experimental programme does not attach those later explanations, or the Curie family’s radioactivity discoveries, to the 1895 thesis.
Turn a familiar slogan into a precise source check
Find the original passages that state the inverse-temperature pattern and the nearby qualifications. Make a two-column note: which materials or regimes support the approximation, and which exceptions the author records. Then check whether a modern summary has silently omitted those conditions. A helpful submission can restore a missing condition or distinguish a later theory from an earlier observation. It should cite the exact thesis page and should not describe a classroom arithmetic exercise as an experimental replication.
Scientific scope
Pierre Curie’s 1895 experimental thesis, with earlier 1892-1894 reports acknowledged. The inverse-temperature relation is approximate and material/regime dependent; the original notes palladium and a diamagnetic offset. Historical transformation temperatures are not silently replaced by modern values. No later Curie-Weiss theory, universal exact law, quantum explanation or radioactivity contribution is assigned to this work.
Read the original work
Sources and reading locations for this explanation
- Pierre Curie 1895 thesis: original digitized pages
Pinned original contribution and stated hypotheses or experimental limits.
- Pierre Curie notice on his scientific work
Pinned original contribution and stated hypotheses or experimental limits.
This English explanation is an editorial reading view. It does not replace the complete original work or certify its science.
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People and systems
Pierre Curie
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