**Pr. Zhong-Cheng Liang**

Nanjing University, China

**Talk Title**

**Statistical Thermodynamic Properties of Elastic Particle System**

**Talk Abstract**

In history, the laws of classical thermodynamics are summarized from thermal energy engineering and application. According to the elastic particle model and the particle statistical method proposed by the author, the thermodynamic laws are contained in a complete axiomatic theoretical system. Elastic particles are objects that have mass and volume, that can spin and deform. Electrons, atoms and molecules can all be regarded as elastic particles. The interaction of elastic particles comes from two kinds of constraints: the repulsion of particle volume and the conservation of particle number. Elastic particles have three spatial states of position, posture and profile, and have three motion modes of translation, rotation and vibration. The three mode energies of * *particles form a Cartesian energy space. The energy space is divided into six phases and three zones. The three zones represent liquid, solid and gas. The six phase interfaces are grouped into G-type and J-type, representing continuous and discontinuous phase transitions respectively. There are three equilibrium surfaces in energy space, which represent thermal equilibrium, magnetic equilibrium and vibration equilibrium respectively. The average energies of the three modes corresponds to translation quantum , rotation quantum and vibration quantum . The energies of equilibrium state are quantized. Energy numbers are positive integers representing thermodynamic steady state. Cluster ensemble is a set of time series of the particle configuration, which can be accurately described by a cluster matrix. The partition functions of gas, solid and liquid can be accurately calculated in the energy space. Energy statistics function reveals the relationship between physical space and energy space. The motion energy and order parameter of the object can be expressed by the statistical correlation of the mass, rotary inertia and elastic modulus of the particles. Through the energy decomposition by the volume , the particle number and the cluster number , the equations of object state are obtained. Through ensemble statistics, the complete energy relations and thermodynamic equations are derived. For example, the basic equation of internal energy is . The expressions of entropy and chemical potential are and respectively. The results show that the elastic particle model reflects the essential feature of real particles, and physics in nature is the statistical theory of elastic particles. The particle field theory is based on mass and momentum statistics, the energy state theory is based on energy statistics, and new thermodynamics is based on the statistics of cluster ensemble. The achievements of elastic particle theory make us firmly believe in the simplicity and unity of the laws of nature.

**Short Biography**

*Theoretical Physics.*2019,

**4**

**:**85-102), energy state (Motion, energy and state of body particle system.

*Theoretical Physics.*2019,

**4**

**:**66-84) and statistical thermodynamics (Cluster ensemble statistics of body particle system.

*New Horizons in Mathematical Physics*. 2019,

**3:**53-73).

**Talk Keywords**

**Target Audience**

**Speaker-intro video**