*2.5. Set Pressure of the DWPG*

In this work a DWPG was used to provide a pressure by loading a known mass on a piston-cylinder ensemble with a known area. The pressure was calculated as

$$P\_{DW} = \frac{(m\_p + \sum\_i m\_i)g \cdot \cos(\theta)}{A\_{eff} [1 + \pi (T\_p - T\_{ref})]} + P\_{hod} \tag{5}$$

where *mp* is the mass of the piston, *mi* is the mass of the individual weights, *g* is the local gravity, *θ* is the angle between the piston cylinder assembly and the gravity vector, *Aeff* is the effective area of the piston at the temperature *Tref* , *α* is the combined temperature expansion of the piston and cylinder, *Tp* is the measured temperature, and *Phood* is the hood pressure [**?** ].
