The most abundant element in the Sun and in the stars are hydrogen and helium. Like most of the stars, there is a spontaneous radioactive reaction happening in the Sun. Hydrogen is transformed into Helium. As long as the stars are young, the most abundant element is hydrogen.
In drinking water the clear, colorless chemical chlorine might be found. The chlorine is added <span>to drinking </span>water to disinfect it and kill germs. The process is called Water Chlorination. Chlorine is a highly efficient disinfectant. Its purpose in drinking water is to kill <span>bacteria, viruses, and protozoans, that commonly grow in </span>water<span> supply reservoirs, on the walls of </span>water<span> mains and in storage tanks.</span>
Explanation:
- The rule apply for the multiplication and division is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
- The rule apply for the addition and subtraction is :
The least precise number present after the decimal point determines the number of significant figures in the answer.
a) 12.3 mm × 15.853 mm :
Three significant figures.
b) 72.98 · 15.830 ml
Three significant figures.
c) 12.3 mm + 15.853 mm
Three significant figures.
d) 172.3 cm - 15.853 cm
Four significant figures.
False the ability to conduct heat is a physical property