In my quest to achieve a 1Pa to 5 Pa vacuum (see earlier posts) a question of how long to run the pump for. The pump reaches an optimum pressure quickly and then the reduction becomes almost insignificant but there appears to be very small reduction over 15 to 30 minutes is there any point in...
I have built a homemade vacuum chamber with the intention of developing a reliable vacuum of 1 Pa to 5 Pa, however when I isolate the pump the pressure rises by 100 Pa in 5-10 minutes and then the rate tapers off to insignificant rise after 24 hrs approx; between 900 Pa to 2,400 Pa (similar to...
I am trying to replicate a vacuum flask (on a low budget) with a 1m long 8 inch UPVC pipe forming the outer shell. A search of the internet suggests that the influence of convection stops around 10 Pa, however the vacuum pump I have, a two stage rotary 3 cfm advertised to achieve a vacuum of 2...
