I shot a mouse ball (without the rubber) about 5cm away from my head at 130 psi when I accidentally triggered the blowgun with the base of my floor pump (I was holding the cannon and pump in one hand). Also, one of the elbows popped off when I was pumping and the schrader valve has been blown out of...

Everything taken from Wikipedia . Pykrete is a composite material made of approximately 14% sawdust and 86% ice by weight. Pykrete has some interesting properties, notably its relatively slow melting rate (due to low thermal conductivity), and its vastly improved strength and toughness over pure ice...

http://www.copper.org/applications/plumbing/techref/cth/images/design-data-ratings-form1.gif WHERE: P = allowable pressure, psi S = maximum allowable stress in tension, psi tmin = wall thickness (min.), in. Dmax = outside diameter (max.), in. C = a constant For copper tube, because of copper's supe...