{
  "annotation_id": "d371fdf9-1c9d-45a7-bb12-0b94215fc602",
  "date_created": "2026-03-02T18:00:32.239000Z",
  "date_modified": "2026-03-02T18:00:32.239000Z",
  "file_hash": "88dd3c02a7df80af09fcec80126529ded6d08dbef273836a20bb100d9b464ba6",
  "private": false,
  "record": {
    "abstract": "The 1st law of thermodynamics for heat exchange is dQ=dU+PdV. According to K.\nMartinas etc., J. Non-Equil. Thermod. 23 (4), 351-375 (1988), for substances\nwith negative thermal expansion coefficient, P in this law is negative. In the\npresent paper it has been shown that P for such substances is positive but the\nsign before P must be minus not plus: dQ=dU-PdV.",
    "arxiv_id": "physics/0010051",
    "authors": [
      "I. A. Stepanov"
    ],
    "categories": [
      "physics.gen-ph",
      "physics.class-ph"
    ],
    "title": "Thermodynamics of Substances with Negative Thermal Expansion Coefficient",
    "url": "https://arxiv.org/abs/physics/0010051"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "64fb97ab-e293-4165-9cff-6bed5b10bb7e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}