what is the purpose of a vent in a plumbing system
Drain-waste-vent system In modern plumbing, a drain-waste-vent (or DWV) is part of a system that removes sewage and greywater from a building, and regulates air pressure in the waste-system pipes to aid free flow. Waste is produced at fixtures such as toilets, sinks, and showers, and exits the fixtures through a trap, a dipped section of pipe that always contains water.
Boyle's law where P is the pressure of the gas, V is the volume of the gas, and k is a constant.
Import quota Quotas, like other trade restrictions, are typically used to benefit the producers of a good in that economy.
Capability Maturity Model Integration Maturity Level 5 - Optimizing