What is a vacuum example?

What is a vacuum example includes both scientific vacuum spaces and household vacuum cleaner devices to illustrate concept. Scientific example of vacuum is outer space, which is near-perfect vacuum with only few atoms per cubic meter and pressure close to zero, astronauts need spacesuit because no air. Another example is inside a thermos flask where vacuum between walls insulates by preventing heat transfer. Vacuum sealed food package is example where air removed to preserve food. Inside light bulb, old incandescent bulbs have partial vacuum or inert gas to prevent filament burning. Laboratory vacuum chamber used for experiments is example. For household appliance, example of vacuum is Dyson V15 Detect cordless stick vacuum that uses cyclonic suction, or iRobot Roomba robot vacuum that autonomously cleans floors. Other examples include Shop-Vac wet dry vacuum for garage, handheld Dustbuster for car, central vacuum system built into house, and industrial vacuum for factories. So vacuum example can be empty space like space or thermos, or device like upright vacuum that creates suction to clean carpets and floors by removing dirt.