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Searching for questions in category materials

Found 85 questions. Showing results 1 to 5.

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1.	How do antiseptic soaps work?
2.	Hi! Thanks for answering my last question on magnets. This question is sort-of a follow-up question: Are there any circumstances, or can you guys think of any ways, where a compass needle would spin in circles due to its interact with a magnetic field? Maybe if the compass was in a circular magnet or if the needle was slightly off-center to create some sort of net force? Your info is great, thanks!
3.	Hi, Did you get these questions? Would it be possible to make a clearance between two objects so small that it would prevent water from passing between those objects, essentially making the mechanism "water- tight?" If so, how small would the clearance have to be? Would it be possible to make a clearance between two objects so small that it would prevent air from passing between those objects, essentially making the mechanism "air-tight?" If so, how small would the clearance have to be? Thanks for your help!
4.	Hi! I have a question involving pistons... What is the average clearance, or space, between the piston of a car that moves up and down, and the outer part that the piston moves in? The clearance obviously must be small enought to provide an air-tight seal, but I also want to know what the max. possible clearance between two objects can be to still allow an air- tight "seal"? Thanks for your help! I hope to be hearing from you soon.
5.	How does lightning make glass