A screw threaded into a blind hole often traps air that can become a virtual leak in the vacuum system. Consider a 1000-liter chamber containing eight 0.635 cm diameter screws, each of which leaves a 0.0794-cm space at the bottom of a blind hole. (a) What chamber pressure would be associated with this source of trapped gas? (b) Virtual leaks tend to release gas in bursts. If so, explain the pressure gauges you would use to monitor such leaks. Would you recommend digital gauge readouts?