Vapour Pressures of Vacuum Pump Oils

Vapour pressures of hydroxybenzophenone UV absorbers

A thermogravimetric method was used to measure the vapour pressures of a series of hydroxybenzophenone UV stabilisers. Enthalpies of vaporisation were determined from the slope of a plot of the logarithm of the vapour pressure against reciprocal absolute temperature. Enthalpies of sublimation were measured either directly by the same method or by summing the enthalpy of vaporisation with the en...

Vacuum Gauge to Vacuum Pump Valve

Estimating the vapour pressures of alpha-pinene products

Introduction Conclusions References Tables Figures Back Close Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Print Version Interactive Discussion EGU Abstract A prediction method based on group contribution principles is proposed for estimating the vapour pressure of α-pinene oxidation products. Temperature dependent contributions are provided for the f...

Interaction of Cryogen Spray with Human Skin under Vacuum Pressures

Clinical results recently demonstrated improvement in lesion blanching using local vacuum to target small vessels in port wine stains (PWS) birthmarks laser therapy. The release of cryogen spurts under vacuum pressures may also offer many advantages to this therapeutic procedure due to different spray-surface interactions under vacuum conditions, which may lead to enhanced heat transfer. The ob...

4 Vacuum pressures and energy in a strong magnetic field

We study vacuum in a strong magnetic field. It shows a nonlinear response, as a ferro-magnetic medium. Anisotropic pressures arise, and a negative pressure is exerted in the direction perpendicular to the field. The analogy of this effect with the Casimir effect is analyzed. The vacuum transverse pressure is found to be of the same order of the statistical pressure for B ∼ 10 15 G and N ∼ 10 33...