China
Africa
Explore chapters and articles related to this topic
In, Out, Shake It All About
Published in Sharon Ann Holgate, Understanding Solid State Physics, 2021
This theory contrasted with that of the French physicists Alexis-Thérèse Petit (1791–1820) and Pierre Dulong (1785–1836), who had previously discovered a relationship known as the Dulong–Petit law. This law states that the specific heat of any solid multiplied by its atomic weight is a constant with an approximate value of 25 J mol−1 K−1.
Properties of a material continuum
Published in David Jiles, Introduction to the Electronic Properties of Materials, 2017
This seems to imply that the heat capacity is dependent only on the number of elementary entities, either atoms or molecules depending on the material. However, even this law only applies at high temperatures, since the heat capacity varies with temperature as we shall see in the next chapter. The molar heat capacity deviates significantly from the value predicted by the Dulong-Petit law at lower temperatures (e.g. below 100 K in lead, below 400 K in aluminium and copper and even at higher temperatures in carbon).
Physical Properties and Effect of Helium-Vacancy Pair on Tungsten/Graphene Composite as Plasma-Facing Materials from First Principles
Published in Fusion Science and Technology, 2023
Yan Qizhen, Zhaochun Zhang, Guo Haibo, Wang Yang
As shown in Fig. 11a, in the low-temperature zone, the heat capacity at constant pressure and the heat capacity at constant volume both increase rapidly. In the high-temperature area, with the increase of temperature, the increase rate of constant pressure heat capacity slows down significantly, and the constant volume heat capacity does not change with temperature. This is consistent with the Dulong-Petit law; that is, the constant volume heat capacity of the system at high temperature is equal to 3R (R = 8.314 J·mol−1·K−1). And, the constant pressure heat capacity of the tungsten/graphane system is slightly higher than others at the high-temperature zone.