L1 slide 13: Closed vs open system (ENGR5003)

L1 slide 13: Closed vs open systemFrom lectureCurrent specThird3 marks3 min

A sealed bottle of water is heated on a hot plate. During the heating process, the bottle remains closed and no water enters or leaves the bottle.

Formulas you may need

Closed system (control mass): no mass crosses the boundary; energy can cross as heat and/or work (learn this)
Open system (control volume): mass and energy cross the boundary (learn this)

(a)
Which statement is correct?
AIt is an open system because energy enters the system.BIt is a closed system because no mass crosses the system boundary.CIt is an isolated system because the bottle is sealed.DIt is an open system because heat is transferred into the system.
[1]
(b)
State what can and cannot cross the boundary of (i) a closed system, (ii) an open system and (iii) an isolated system, giving one engineering example of each.
[2]