Adolfo Bartoli and the problem of radiant heat

Carazza, B.; Kragh, Helge

doi:10.1080/00033798900200191

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…The momentum carried by fields and propagating waves has played a central role in the development of physics, impacting early discussions on the nature of light, the Second Law of Thermodynamics, the Stefan-Boltzmann law, and the development of Quantum Mechanics [1]. The association of this momentum with "action at a distance" has intrigued humankind for centuries, yielding science fiction concepts such as the "tractor beam," in which an outflow of energy results, somewhat counterintuitively, in an influx of matter.…”

Section: Pacsmentioning

confidence: 99%

Acoustic Tractor Beam

et al. 2014

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Negative radiation forces act opposite to the direction of propagation, or net momentum, of a beam but have previously been challenging to definitively demonstrate. We report an experimental acoustic tractor beam generated by an ultrasonic array operating on macroscopic targets (>1 cm) to demonstrate the negative radiation forces and to map out regimes over which they dominate, which we compare to simulations. The result and the geometrically simple configuration show that the effect is due to nonconservative forces, produced by redirection of a momentum flux from the angled sides of a target and not by conservative forces from a potential energy gradient. Use of a simple acoustic setup provides an easily understood illustration of the negative radiation pressure concept for tractor beams and demonstrates continuous attraction towards the source, against a net momentum flux in the system.

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Section: Pacsmentioning

confidence: 99%

Acoustic Tractor Beam

et al. 2014

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“…2, 441). In modern units, the value is 4.2×10 −6 Pa. A few years later the Italian physicist Adolfo Bartoli argued independently for a radiation pressure, which Boltzmann confirmed and amplified in a paper of 1884 (Carazza and Kragh, 1989).…”

Section: Radiation Pressure Aurorae and Comets' Tailsmentioning

confidence: 76%

Svante Arrhenius, cosmical physicist and auroral theorist

Kragh

2013

Hist. Geo Space. Sci.

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Abstract. Many scientists in the fin de siècle era saw a need to coordinate and unify the increasing amount of data relating the physical conditions of the Earth and the Sun; or more generally to establish a synthetic perspective that covered the earth sciences in relation to the new astrophysical sciences. Promoted under the label "cosmical physics", the unifying solar-terrestrial perspective was in vogue for a decade or two. Perhaps more than any other scientist in the period, the versatile Swedish chemist and physicist Svante Arrhenius represented the aims of cosmical physics. A central problem in the new and ambitious research programme was to understand the origin and nature of the aurora, and to relate it to other celestial phenomena such as the solar corona and the tails of comets. In 1900 Arrhenius proposed a unified explanation of these and other phenomena based on the Sun's radiation pressure. The theory was widely discussed, praised as well as criticized. Arrhenius was not only a key scientist in the short-lived tradition of cosmical physics, but also influential as a popular writer and powerful member of the Nobel Committee for Physics. His work illustrates an approach to the earth and space sciences characteristic of the fin de siècle period.

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“…Josef Stefan noticed that the amount of radiation emitted by a hot body could be described as proportional to the fourth power of the temperature [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52]. Ludwig Boltzmann [53,54] reified Stefan's hypothesis by treating electromagnetic radiation as an analog to a gas surrounded by walls using already established relationships between energy density and pressure [55][56][57][58]. Experiments by Lummer and Pringsheim [59] on the radiation produced in the cavity of a blackbody held at constant temperatures ranging from 373.1 K to 1561 K confirmed the theoretical formulae of Stefan and Boltzmann.…”

Section: Stefan-boltzmann Law For Bodies Made Of Positive or Negativementioning

confidence: 99%

Symmetry and the order of events in time: the thermodynamics of blackbodies composed of positive or negative mass

Wayne¹

2015

Turk J Phys

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I have previously proposed a discrete symmetry called CPM (charge-parity-mass) symmetry that defines matter as having positive mass and antimatter as having negative mass-both being involved in processes that proceed forward in time. I have generalized the second law of thermodynamics to describe and predict the order of events in time that take place in reversible thermodynamic systems composed of positive or negative mass. Here I extend the CPM symmetry to irreversible thermo-optical radiation systems characterized by the Stefan-Boltzmann law, Planck's blackbody radiation law, and Einstein's law of specific heat. The laws of radiation analyzed in terms of CPM symmetry may provide a fresh way of understanding old topics such as the photon and entropy and new topics such as the nonluminous substances in the universe known as dark matter.

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Adolfo Bartoli and the problem of radiant heat

Cited by 14 publications

References 13 publications

Acoustic Tractor Beam

Acoustic Tractor Beam

Svante Arrhenius, cosmical physicist and auroral theorist

Symmetry and the order of events in time: the thermodynamics of blackbodies composed of positive or negative mass

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