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2. Water aeration - Wikipedia

   en.wikipedia.org/wiki/Water_aeration

   The effectiveness of a surface aerator is limited to a small area as they are unable to add circulation or oxygen to much more than a 3-metre radius. This circulation and oxygenating is then limited to the uppermost portion of the water column, often leaving the bottom portions unaffected. Low speed surface aerators can also be installed on floats.

3. Diffuser (sewage) - Wikipedia

   en.wikipedia.org/wiki/Diffuser_(sewage)

   An air diffuser or membrane diffuser is an aeration device typically in the shape of a disc, tube or plate, which is used to transfer air and with that oxygen into the sewage or industrial wastewater. Oxygen is required by microorganisms/bacteria residents in the water to break down the pollutants.

4. Lawn aerator - Wikipedia

   en.wikipedia.org/wiki/Lawn_aerator

   Core lawn aerator attachment on a conventional front-tine garden tiller A lawn aerator is a garden tool designed to create holes in the soil in order to help lawn grasses grow. [ 1 ] In compacted lawns, aeration improves soil drainage and encourages worms , microfauna and microflora which require oxygen .

5. Deaerator - Wikipedia

   en.wikipedia.org/wiki/Deaerator

   Vacuum deaerators are also used in the petrochemical field. [5] In 1921 a tank with vacuum pump for removing gases was used in Pittsburgh. [23] In 1934 and 1940 a tank with vacuum pump for removing gases were used in Indiana. [24] [25] Vacuum deaerators can be rubber lined on the inside to protect the steel heads and shell from corrosion. [26]

6. Lawn mower - Wikipedia

   en.wikipedia.org/wiki/Lawn_mower

   The lawn mower was invented in 1830 by Edwin Beard Budding of Stroud, Gloucestershire, England. [1] Budding's mower was designed primarily to cut the grass on sports grounds and extensive gardens, as a superior alternative to the scythe, and was granted a British patent on August 31, 1830.