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2. Vacuum packing - Wikipedia

   en.wikipedia.org/wiki/Vacuum_packing

   External vacuum sealers involve a bag being attached to the vacuum-sealing machine externally. The machine will remove the air and seal the bag, which is all done outside the machine. A heat sealer is often used to seal the pack. Typically these units use a dry piston vacuum pump which is often considered a "maintenance-free" pump.

3. Vac-U-Form - Wikipedia

   en.wikipedia.org/wiki/Vac-u-form

   The Vac-u-form, was a toy invented by Eddy Goldfarb and released by Mattel in the 1960s around 1961 with the trademark filed on October 8, 1962. [1]Based on the industrial process of vacuum forming, a rectangular piece of plastic was clamped in a holder and heated over a metal plate.

4. Seal (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Seal_(mechanical)

   A seal is a device or material that helps join systems, mechanisms or other materials together by preventing leakage (e.g. in a pumping system), containing pressure, or excluding contamination. The effectiveness of a seal is dependent on adhesion in the case of sealants and compression in the case of gaskets .

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6. Railway air brake - Wikipedia

   en.wikipedia.org/wiki/Railway_air_brake

   The vacuum brake is also considerably slower to both apply and release the brake, which requires a greater level of skill and anticipation from the driver. Conversely, the vacuum brake originally had the advantage of allowing gradual release, whereas the Westinghouse automatic air brake was originally available in only the direct-release form ...

7. Lead–acid battery - Wikipedia

   en.wikipedia.org/wiki/Lead–acid_battery

   The electrolyte can seep from the plastic-to-lead seal where the battery terminals penetrate the plastic case. Acid fumes that vaporize through the vent caps, often caused by overcharging, and insufficient battery box ventilation can allow the sulfuric acid fumes to build up and react with the exposed metals.