Assertion: steam engine's steam | /r/CapableOf | expand to fill the space
Facets:
value: back of the piston
type: OTHER
value: until the end of the stroke
type: TEMPORAL
Source sentences:
text: The total pressure on the piston is equal to the area in square inches multiplied by the pressure per square inch, and this pressure is not constant but varies, being nearest boiler pressure during the early part of the stroke and decreasing after the point of cut-off is reached, as the steam expands to fill the space back of the piston, until the end of the stroke.