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# constants.RGAS

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```float(x) -> floating point number

Convert a string or number to a floating point number, if possible.
```

```        """
mt = self.params.measurement_temp + const.DEG_TO_KELVIN
return k25 * exp((Ea * (Tk - mt)) / (mt * const.RGAS * Tk))

def peaked_arrh(self, k25, Ea, Tk, deltaS, Hd):
```
```
arg1 = self.arrh(k25, Ea, Tk)
arg2 = 1.0 + exp((mt * deltaS - Hd) / (mt * const.RGAS))
arg3 = 1.0 + exp((Tk * deltaS - Hd) / (Tk * const.RGAS))

```

```        #  - mol/sec to m/s See Jones, 1992, appendix
tk = tavg + const.DEG_TO_KELVIN
MOL_SEC_2_M_PER_SEC = const.MM_TO_M / (press / (const.RGAS * tk))
M_PER_SEC_2_MOL_SEC = 1.0 / MOL_SEC_2_M_PER_SEC

```
```            # Convert mol/sec to m/s See Jones, 1992, appendix
tk = tair[i] + const.DEG_TO_KELVIN
MOL_SEC_2_M_PER_SEC = const.MM_TO_M / (press / (const.RGAS * tk))
M_PER_SEC_2_MOL_SEC = 1.0 / MOL_SEC_2_M_PER_SEC

```

```        * Medlyn et al. 2002, PCE, 25, 1167-1179.
"""
return k25 * exp((Ea * (Tk - self.mt)) / (self.mt * const.RGAS * Tk))

def peaked_arrh(self, k25, Ea, Tk, deltaS, Hd):
```
```        """
arg1 = self.arrh(k25, Ea, Tk)
arg2 = 1.0 + exp((self.mt * deltaS - Hd) / (self.mt * const.RGAS))
arg3 = 1.0 + exp((Tk * deltaS - Hd) / (Tk * const.RGAS))

```