Physics Help Forum Dimensions of vacuum tube

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 Nov 4th 2017, 04:15 PM #1 Junior Member   Join Date: Aug 2017 Posts: 4 Dimensions of vacuum tube Hello For the purpose of the experiment, I wonder what thickness should the glass(?) have to withstand? I thought over a diameter of 30cm and a length of 1-1,5m and from what material should such a pipe be made. I would like to get a high vacuum (about 0,2-2Pa)
 Nov 4th 2017, 11:46 PM #2 Senior Member   Join Date: Apr 2017 Posts: 474 acrylic(perspex) might be best for this , fairly strong and not brittle ... In theory if using glass , it need not be too thick ... the danger is it getting knocked when holding a vacuum , it's very brittle and could shatter , failure could be very nasty. ...Thicker glass would help mitigate this danger , but angles and joints will be the weak points . How would you connect the chamber to the pump ??? If I were doing it I'd use acrylic , nice material to work with , can be heat formed , or glued , could be made square like an aquarium , and no danger of catastrophic failure , I'm sure many youtube videos on working with this material..... Fairly expensive ....to reduce cost most of the chamber could be made from other material , glass fibre reinforced plastic or steel, or even wood carefully sealed .... the front face could be acrylic , a removeable front to access the chamber , with a rubber seal on the 'door frame' , the vacuum will suck in the door to the seal and hold it in place . For a 'door' 1meter by 30cm the acrylic needs to be about 1 cm thick , just this door will cost around \$100 The tube leading to the pump can be nylon reinforced clear plastic flexible tube (easy to obtain) keep the diameter small to prevent it collapsing under vacuum (ID about 8mm, depending on pump) topsquark likes this. Last edited by oz93666; Nov 5th 2017 at 12:05 AM.

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