I've been researching parallel plate capacitors but couldn't find many experiments on how long a sealed parallel plate capacitor could possibly hold its charge and why.
To experiment, I ordered a 5 cfm vacuum generator w/chamber and plan on putting a copper parallel plate capacitor inside it at around 30 Hg. The plates have an area of 0.049 m², are about 1 mm thick, and about 7 mm apart. After charging it to, say, 15 V and disconnecting the leads, I'm wondering how long the charge will hold and why.
Any thoughts what'll happen? Any feedback is greatly appreciated!