Aerosol-and-ethylene-gas.docx

An aerosol is a suspension of fine solid particles or liquid droplets, in air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are haze, particulate air pollutants and smoke. The liquid or solid particles have diameter mostly smaller than 1 μm or so; larger particles with a significant settling speed make the mixture a suspension, but the distinction is not clear-cut. In general conversation, aerosol usually refers to an aerosol spraythat delivers a consumer product from a can or similar container. Other technological applications of aerosols include dispersal of pesticides, medical treatment of respiratory illnesses, and convincing technology. Diseases can also spread by means of small droplets in the breath, also called aerosols (or sometimes bioaerosols). Aerosol science covers generation and removal of aerosols, technological application of aerosols, effects of aerosols on the environment and people, and a wide variety of other topics.

What is Ethylene Gas? Without scent and invisible to the eye, ethylene is a hydrocarbon gas. Ethylene gas in fruits is a naturally occurring process resulting from the ripening of the fruit, or may be produced when plants are injured in some way. So, what is ethylene gas? Ethylene gas in fruits and vegetables is actually a plant hormone which regulates the plant’s growth and development as well as the speed at which these occur, much as hormones do in humans or animals. Ethylene gas was first discovered about 100 years ago when a student noticed that trees growing near gas street lamps were dropping leaves more rapidly (abscising) than those planted at a distance from the lamps. Effects of Ethylene Gas and Fruit Ripening Cellular amounts of ethylene gas in fruits reaches a level whereupon physiological changes occur. The effects of ethylene gas and fruit ripening may also be affected by other gases such as carbon dioxide and oxygen, and varies from fruit to fruit. Fruits such as apples and pears emit a greater amount of ethylene gas in fruits, which affects their ripening. Other fruits, like cherries or blueberries, produce very little ethylene gas and it, therefore, does not impinge upon the ripening process. The effect of ethylene gas upon fruit is a resulting change in texture (softening), color and other processes. Thought of as an aging hormone, ethylene gas not only influences the ripening of fruit but may also cause plants to die, generally occurring when the plant is damaged in some manner. Other effects of ethylene gas are loss of chlorophyll, abortion of plant foliage and stems, shortening of stems, and bending of the stems (epinasty). Ethylene gas can be either a good guy when used to hasten ripening of fruit, or a bad guy when it yellows vegetables, damages buds or causes abscission in ornamental specimens

Further Information on Ethylene Gas A plant messenger that signals the plant’s next move, ethylene gas can be used to trick the plant into ripening its fruits and vegetables earlier. In commercial environments, farmers use liquid products that are introduced pre-harvest. The consumer may do this at home by simply placing the fruit or vegetable in question inside a paper bag, like a tomato. This will concentrate the ethylene gas inside the bag, allowing the fruit to ripen more

quickly. Do not use a plastic bag, which will trap moisture and may backfire on you, causing the fruit to rot. Ethylene may be produced not only in ripening fruit, but from internal combustion exhaust engines, smoke, rotting vegetation, natural gas leaks, welding and in some types of manufacturing plants. Read more at Gardening Know How: What Is Ethylene Gas: Information On Ethylene Gas And Fruit Ripening https://www.gardeningknowhow.com/edible/fruits/fegen/ethylene-gas-information.htm

Historical Examples 

Ethylene ripening of tomatoes in relation to stage of maturity. The Tomato Paul Work

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This converts the alcohol into a gas known as ethylene (C2H4). Creative Chemistry Edwin E. Slosson

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Acetylene combines with hydrogen in the presence of platinum black, and ethylene and then eth ane result. Acetylene, The Principles Of Its Generation And Use F. H. Leeds

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The idea held up to about 1890 was that the illuminating value depended upon the amount of ethylenepresent. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 Various

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Dichloride of ethylene is detected by shaking up the chloroform with dry potassic carbonate, and then addingmetallic potassium. Poisons: Their Effects and Detection Alexander Wynter Blyth