By Lajos Kovács, Dezső Csupor, Gábor Lente, Tamás Gunda

ISBN-10: 3319084186

ISBN-13: 9783319084183

ISBN-10: 3319084194

ISBN-13: 9783319084190

100 Chemical Myths offers with renowned but principally unfaithful misconceptions and misunderstandings concerning chemistry. It comprises lucid and concise factors lower via fallacies and concrete legends which are universally proper to a world viewers. quite a lot of chemical myths are explored in those components; foodstuff, medications, catastrophes, chemical compounds, and environmental difficulties. Connections to pop culture, literature, videos, and cultural heritage carry the reader’s curiosity when key ideas are superbly annotated with illustrations to facilitate the knowledge of unusual fabric. Chemical Myths Demystified is pitched to members with no formal chemistry heritage to fledgling undergraduate chemists to professional researchers and beyond.

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Unfortunately, they are also quite deceiving if their meaning is taken literally. 11). Normal oxygen, the one everyone breaths, consist of diatomic molecules. The words ozone shield or ozone layer (the meaning is the same) are used to refer to the amount of ozone that is present in the Earth’s stratosphere, which lies approximately between 10 and 50 km above the ground. Air is very thin at such high altitudes, definitely not dense enough to support human breathing. In this thin gas, ozone only makes up a tiny proportion, but it is still much more than the ozone found in the troposphere (the 10 km of air close to the ground).

The reasons behind the 1991 contagion in Peru are still not clear: poor sanitation, tainted drinking water, unwashed fruits and vegetables, consumption of raw fish, warming by El Niño, floods, Vibrio cholerae bacteria surviving in zooplankton, and the unusually high incidence of the 0 blood group (75 %) in Peru could all have contributed. Cholera is not that difficult to fight. Dehydration of patients must be prevented to cure them and transmission can be slowed down by improving sanitation. There is a classic case in cholera studies: John Snow (1813–1858), a physician living in London, made systematic observations during a cholera outbreak in 1854 and proved that the contagion can be controlled by carefully checking the quality of drinking water delivery systems.

What is wrong with the ice-melting argument? Well, the argument only says something about the direction of changes, but never tries to estimate their magnitude. If we think a little deeper, this theory about ice melting under skates would lead to a number of consequences that are definitely not true. 1. Children would have more difficulty when skating because their weight is lower and they would exert a lower pressure. 2. The colder the temperature is, the more difficult would be to move on a skate as higher pressure would be needed to achieve a larger change in the melting point of ice.

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100 Chemical Myths: Misconceptions, Misunderstandings, Explanations by Lajos Kovács, Dezső Csupor, Gábor Lente, Tamás Gunda


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