Sentences with phrase «oxygen and hydrogen present»

Soot - Particles formed during the quenching of gases at the outer edge of flames of organic vapors, consisting predominantly of carbon, with lesser amounts of oxygen and hydrogen present as carboxyl and phenolic groups and exhibiting an imperfect graphitic structure.

Not exact matches

Although atmospheric oxygen soon recovered again as photosynthesis and weathering reached a new balance, at about 10 per cent of present - day levels, the oxidative weathering of sulphides on land filled the oceans with sulphate which created abundant food for a group of bacteria that filled the oceans with sewer gas (hydrogen sulphide) toxic to oxygen - loving lifeforms (delaying the development of eukaryotic plants and animals) and turned them «into stinking, stagnant waters almost entirely devoid of oxygen.»

Generally, for life to spontaneously emerge anywhere in the universe, there are three factors that need to be present: Water, certain elements (carbon, oxygen, hydrogen, nitrogen, and phosphorus), and time.

The hydrogen peroxide breaks down to water and oxygen shortly after use and these products give off none of the unpleasant fumes associated with traditional products which makes them safer to use when people are present.

Using biology as a starting point for the study of boundaries and fragmentation in the human body, Joana Ricou presents in this, her first solo exhibit in Portugal, the series Multitudes (painting and works on wood and paper), paintings from the series Henrietta Lacks or HeLa cells searching, and the site - specific installation 60 kilos of Human Being (Oxygen, hydrogen, nitrogen, carbon, calcium and sulfur).