# Accession Number:

## ADP006635

# Title:

## Thermodynamics and Gravity,

# Descriptive Note:

# Corporate Author:

## ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

# Personal Author(s):

# Report Date:

## 1992-03-01

# Pagination or Media Count:

## 28.0

# Abstract:

A calculation of the effects of a gravitational field on the state equations of real materials is presented. The effects arise from the broken symmetry of the spacetime coordinates of the region in which the gravity field is located. The form of the laws of thermodynamics for matter located in a gravity field is investigated by applying the broken spacetime symmetry forms of the first and second laws of thermodynamics. In a gravity field the laws of thermodynamics are dependent on the internal phase angles theta rr of the radial coordinates of a gravitating mass, and this dependence can also be expressed in terms of the gravitational constant Grr whose value depends on radial distance. In this way the effects of a gravity field on the state equations of real gases, solids and quantum liquids is determined. The Debye theory of solids is generalized to include the case of a solid located in a gravity field. This paper suggests thermodynamic measurements that can be used to determine Grr for a planetary gravity field. Because the internal phase angles of the radial coordinates are related to the photon redshift in a gravity field it is suggested that the photon redshift may be used to determine the variation of Grr with radial distance.

# Descriptors:

# Subject Categories:

- Thermodynamics
- Astrophysics