In the XVII century. English physicist Robert Boyle (1627-1691) and French physicist Edm Marriott (1620-1684) independently experimentally investigated a thermodynamic system – a gas in a closed vessel. In this case, the mass of the gas and its temperature remained unchanged. The other two parameters – pressure and volume – changed during the transition of the system from one state to another.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.