Carbon 14 dating definition


26-Dec-2017 11:13

It is the second most abundant element in the human body by mass (about 18.5%) after oxygen.

The physical properties of carbon vary widely with the allotropic form.

All carbon allotropes are solids under normal conditions, with graphite being the most thermodynamically stable form.

Carbon 14 has a half-life of 5,780 years, and is continuously created in Earth's atmosphere through the interaction of nitrogen and gamma rays from outer space.

Carbon compounds form the basis of all known life on Earth, and the carbon-nitrogen cycle provides some of the energy produced by the Sun and other stars.

Although it forms an extraordinary variety of compounds, most forms of carbon are comparatively unreactive under normal conditions.

For example, graphite can be oxidised by hot concentrated nitric acid at standard conditions to mellitic acid, C Carbon sublimes in a carbon arc which has a temperature of about 5,800 K (5,530 °C; 9,980 °F).

Thus, irrespective of its allotropic form, carbon remains solid at higher temperatures than the highest melting point metals such as tungsten or rhenium.Although thermodynamically prone to oxidation, carbon resists oxidation more effectively than elements such as iron and copper that are weaker reducing agents at room temperature.



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