what is the enthalpy of the reaction?

If the root word engage means “to connect with something,” what does the word disengage mean in the following sentence? he disengaged the gears by stepping on the clutch pedal.a.added more engine powerb.activated a connection to the pedalc.stalled the engined.released a connection to the pedal

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

What material does not melt at any temperature