| volatility | ความสามารถที่จะระเหยได้ |
| volume batching | การผสมโดยปริมาตร |
| Vector: | (english) A mathematical entity having a magnitude and a direction in space. |
| Velocity: | (english) A vector quantity equal to the rate that position changes with time. |
| Virion | (Environmental Engineering) A virus particle. Viral DNA or RNA enclosed in an organic capsule. See virus. |
| Virus | (Environmental Engineering) A submicroscopic genetic constituent which can alternate between two distinct phases. As a virus particle, or virion, it is DNA or RNA enveloped in an organic capsule. As an intracellular virus, it is viral DNA or RNA inserted into the host organisms DNA or RNA. |
| Volatile solids | (Environmental Engineering) (VS) is the amount of matter which volatilizes (or burns) when a water sample is heated to 550EC.Volatile suspended solids |
| Validation - | (Software Engineering) tests to ensure that the software conforms to its requirements |
| Vapor Pressure | (Concrete Engineering) The pressure exerted by a vapor that is calculated based upon relative humidity and temperature. The higher the humidity and higher temperature, in degrees Fahrenheit, the greater the vapor pressure exerted. |
| Vaporproof | (Concrete Engineering) A material that is totally immune to the passage of a gas under pressure. Any material that is truly vaporproof will inherently be waterproof. |