###### Definition
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Also called Byram’s intensity, this is the rate of energy release per unit length of the fire front expressed as BTU per foot of fireline per second or as kilowatts per meter of fireline (Paysen et al., 2000). This is a physical parameter that is related to . This expression is commonly used to describe the power of s, but it does not necessarily follow that the severity, defined as the vegetation mortality, will be correspondingly high (Carey and Schumann, 2003).