Work of breathing When there is increased gas flow resistance, the optimal respiratory rate decreases. This work (generally during the inhalation phase) is stored as potential energy which is recovered during exhalation. A pressure difference is required to overcome the frictional resistance to gas flow due to viscosity, and to provide non-elastic components of movement of the airway tissues to accommodate pulmonary volume change. Total work done against non elastic forces is 35% of total. Work is defined as a force applied over a distance. The SI unit of work is the Joule, equivalent to a force of 1 Newton exerted along a
Scotland in the modern era Millar and William Robertson, all of whom merged a scientific study of how humans behave in ancient and primitive cultures with a strong awareness of the determining forces of modernity. Indeed, modern sociology largely originated from this movement. Adam Smith developed and published "The Wealth of Nations," the first work on modern economics. It had an immediate impact on British economic policy and still frames 21st century discussions on globalisation and tariffs. The focus of the Scottish Enlightenment ranged from intellectual and economic matters to the specifically scientific as in the work of William Cullen, physician and chemist, James Anderson,