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The Fountain Effect
Plate 065 Physics Poster
Plate 65 speaks for itself: “Heat it, it rises.”
The Physics
Heating superfluid helium behind a fine porous plug draws more superfluid in through the plug, and the pressure rise can jet liquid out of the top.
ΔP = ρ s ΔT
- ΔP: fountain pressure, Pa
- ρ: density, kg m⁻³
- s: specific entropy, J kg⁻¹ K⁻¹
- ΔT: temperature difference, K
Heat draws superfluid in via the plug. The liquid jets out of the top.
Sources
- J. F. Allen, H. Jones, Nature 141, 243 (1938).
On the poster
Plate 065, “The Fountain Effect”: the pixel-art plate with its slogan “Heat it, it rises.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.
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