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2. Mobile payment - Wikipedia

   en.wikipedia.org/wiki/Mobile_payment

   QR code is a square two-dimensional bar code. QR codes have been in use since 1994. [48] Originally used to track products in warehouses, QR codes were designed to replace the older one-dimensional bar codes. The older bar codes just represent numbers, which can be looked up in a database and translated into something meaningful.

3. Power purchase agreement - Wikipedia

   en.wikipedia.org/wiki/Power_purchase_agreement

   A power purchase agreement (PPA), or electricity power agreement, is a long-term contract between an electricity generator and a customer, usually a utility, government or company. [1] [2] PPAs may last anywhere between 5 and 20

4. Chemical oxygen generator - Wikipedia

   en.wikipedia.org/wiki/Chemical_oxygen_generator

   A chlorate candle, or an oxygen candle, is a cylindrical chemical oxygen generator that contains a mix of sodium chlorate and iron powder, which when ignited smolders at about 600 °C (1,100 °F), producing sodium chloride, iron oxide, and at a fixed rate of about 6.5 man-hours of oxygen per kilogram of the mixture.

5. List of free and open-source software packages - Wikipedia

   en.wikipedia.org/wiki/List_of_free_and_open...

   This is a list of free and open-source software packages, computer software licensed under free software licenses and open-source licenses.Software that fits the Free Software Definition may be more appropriately called free software; the GNU project in particular objects to their works being referred to as open-source. [1]

6. Atmospheric water generator - Wikipedia

   en.wikipedia.org/wiki/Atmospheric_water_generator

   An atmospheric water generator (AWG), is a device that extracts water from humid ambient air, producing potable water. Water vapor in the air can be extracted either by condensation - cooling the air below its dew point , exposing the air to desiccants , using membranes that only pass water vapor, collecting fog, [ 1 ] or pressurizing the air.

7. Amazon Air - Wikipedia

   en.wikipedia.org/wiki/Amazon_Air

   An Amazon Air Boeing 737-800(BCF) operated by Sun Country Airlines. Amazon Air (often branded as Prime Air) is a virtual cargo airline operating exclusively to transport Amazon packages. In 2017, it changed its name from Amazon Prime Air to Amazon Air to differentiate themselves from their Amazon Prime Air autonomous