Relative density<span>, or specific gravity, is the </span>ratio of the density<span> (mass of a unit volume) of a </span>substance to the density<span> of a given reference material. Specific gravity usually means relative </span>density<span> with respect to water. The term "relative </span>density<span>" is often preferred in scientific usage.</span>
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.
Answer:
the correct answer is CO2 (the last one)
<span>Copper II Sulfate- Cu 2+ and a sulfate SO4 2- add together nicely to make CuSO4. </span>
Answer:
Earthquake engineering
Aerospace engineering
Coastal engineering
Hydraulic engineering
environmental engineering
construction engineering
structural engineering
