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Why the slope of temperature versus pressure graph is positive in some cases and negative in other cases?
If the pressure is increasing then the slope is positive. If the pressure is decreasing then the slope is negative.
What is negative air machine?
used to create negative pressure in a room when clearing air for asbestos removal and other harmful particulates
What things have positive and negative numbers?
temperature battery magnet blood pressure the earth rotations
If a process is carried out at constant pressure P and the volume V of the system decreases then V is negative positive and the work w is negative positive zero?
In this case, V would be negative, and work w would be positive.
Dose a positive pressure drain need a trap?
A trap on a positive drain is used to avoid the 'contaminated' air in a HVAC system from traveling through the condensate line and entering into areas where it is unwanted. The trap becomes necessary when one condensate line is used for multiple units, especially if it is tied to other negative pressure drain traps. The negative pressure drain traps may not drain properly if they have to overcome the positive non- trapped pressure of another unit. It allows the condensate to drain more evenly, as well. Without a trap, the positive pressure from the unit can blow air through the drain with the water and cause 'spitting.' A trap on a positive pressure system may not always be necessary, but it is good practice to trap every drain and trap it properly. There are guidelines for both positive and negative pressure traps. Always follow the manufacturers recommendations.
