Vacuum Pump low pressure? Science Toys | Science Blog | Log Out | Topics | Search
My Toys | Energy | Moderators | Register | Edit Profile

Scitoys Message Board » I am having trouble building one of the toys » Vacuum Pump low pressure? « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Justin (Commander_bob)
Junior Member
Username: Commander_bob

Post Number: 9
Registered: 10-2006
Posted on Monday, January 15, 2007 - 3:47 pm:   Edit PostDelete PostView Post/Check IPPrint Post   Move Post (Moderator/Admin Only)Ban Poster IP (Moderator/Admin only)

I made the vacuum pump (second version) but I could not find a rubber stopper so I made the original pump (o-rings and pvc). It seems to work well but not that good... I got VERY hot water to boil twice. The marshmallows don't get very large and don't shrink to a gumdrop size, they hardly shrink at all. I bough a clear vinyl tube but it collapses when the vacuum gets to a certain point, there seems to be a little room for the air to still get out but I think it should be working better.

Thank you,

Add Your Message Here
Username: Posting Information:
This is a private posting area. Only registered users and moderators may post messages here.
Options: Enable HTML code in message
Automatically activate URLs in message
For those who have trouble spelling, the Google Toolbar (included in the Google Pack) can check and correct the spelling in your posts on this message board and others.

Renewable Energy

Topics | Last Day | Last Week | Tree View | Search | Help/Instructions | Program Credits Administration