What is heat When the energy changes as a result of a temperature difference between the system and its surroundings we say that there has been a flow of heat As a convention of sign, heat transferred to a ystem is considered positive and heat transferred from a system is considered negative The symbol Q is used to represent heat 4上一内容下一内容令回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 What is heat ? As a convention of sign, heat transferred to a system is considered positive and heat transferred from a system is considered negative. The symbol Q is used to represent heat. When the energy changes as a result of a temperature difference between the system and its surroundings we say that there has been a flow of heat
What is work? Work is energy in the form of orderly motion, which may, in principle be harnessed so as to raise a weight The most common forms of work are pressure-volume work and electrical work In mechanics, work is defined as the product of a force and the displacement when both are measured in the same direction 4上一内容下一内容◇回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 What is work? Work is energy in the form of orderly motion , which may, in principle, be harnessed so as to raise a weight. The most common forms of work are pressure-volume work and electrical work. In mechanics, work is defined as the product of a force and the displacement when both are measured in the same direction
The p-y work SW=-f dI=- pex s dl = pex dv Pex is the external pressure Work done by a system is considered negative and work done on a system is considered positive 4上一内容下一内容◇回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 The P-V work δW = - F dl = - Pex S dl = - Pex dV Pex is the external pressure. Work done by a system is considered negative and work done on a system is considered positive
Explain: the path function is a thermod ynamic propert whose value depends upon the path by which the transition from the initial state to the final state Q and W takes place 4上一内容下一内容◇回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 Explain : the path function is a thermodynamic property whose value depends upon the path by which the transition from the initial state to the final state takes place. Q and W
The first law of thermodynamics is essentially the law of conservation of energy applied to thermodynamic system The energy of an isolated system is constant Through his famous experiments in 1843 Joule was led to the postulate that heat and work were equivalent quantities First kind of perpetual motion machine No way 4上一内容下一内容令回主目录 返回 2021/2/22
上一内容 下一内容 回主目录 返回 2021/2/22 The first law of thermodynamics First kind of perpetual motion machine No way! is essentially the law of conservation of energy applied to thermodynamic system. The energy of an isolated system is constant. Through his famous experiments in 1843 Joule was led to the postulate that heat and work were equivalent quantities