Brennrate

Brennrate is a term used in several fields to denote the rate at which something is consumed by burning. In everyday usage, especially in business, Brennrate (burn rate in English) refers to the rate at which a company spends its available cash. It is typically measured as net cash outflow per month and is used to estimate runway, the time a startup can operate before needing additional funding. Distinctions are made between gross burn (total cash spent) and net burn (cash spent minus income).

In physics and engineering, burn rate describes how quickly a fuel or propellant is consumed in a combustion process. In rocketry and propulsion, burn rate is commonly modeled as a function of chamber pressure, often written as r = a P^n, where r is the linear burn rate, P is pressure, and a and n are empirically determined constants. The burn rate depends on fuel formulation, temperature, pressure, geometry of the combustion surface, and impurities. Burn rate determines the thrust, performance, and stability of a motor, and is a focus of propellant development.

Measurement and management: In finance, tracking burn rate helps plan funding rounds and operations; in engineering, experimental tests, regression models and performance data are used to characterize burn rate under different operating states. The term can appear in other contexts, such as material oxidation or chemical reaction rates, to indicate how quickly a substance is consumed by burning.

See also: Cash burn, Runway, Propellant formulation, Combustion, Oxidation kinetics.