it keep a litle preshure in the crank case to prevent oxygen to get in there (shake oil and osygen and you get wip) and bleed the vapor to the intake.
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Oh, dude, it's like this: when work is done on the system, it's like the system is just chilling and getting stuff done to it, so it's negative because it's like, "Ugh, why are you messing with me?" But when the system does work, it's like, "Yeah, I got this," so it's positive because it's like, "I'm in control, baby!" So, yeah, that's why it's negative when done on the system and positive when done by the system.
In this case, V would be negative, and work w would be positive.
when work is positive and when playing is negative
Yes Work can be positive or Negative.
what is positive and negative