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- Variable
- this indicates that a value can change. For instance, the brightness of a pulsar changes depending on whether or not its beam of light is pointing towards us when we are looking at it.
- Variable (computer science)
- in computer science, a variable is a placeholder for a value that can change. For example, if you are programming how a phone works, you want to make sure that it will be able to dial different phone numbers and be able to retrieve numbers from recent calls. These values (phone numbers) can be stored in variables until they are needed.
- Voltage
- an electromotive force or potential difference expressed in volts.
- Visible
- The name given to the region of the electromagnetic spectrum associated with human sight. Wavelengths of light within this band of electromagnetic radiation are associated with colors perceptible to humans, from red (~700 nm) to violet (~400 nm).
