The uses and laws of reflection of sound waves
The reflection The reflection is the change in the direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated such as...
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Two ovaries and Fallopian tubes in the female reproductive system
The female reproductive system The female reproductive system consists of two ovaries, two fallopian tubes, the uterus and the vagina, It is called the female genital system, It is made up of the internal...
The properties of the molecules of the matter
The molecule The matter is composed of small building units called the molecules which are composed of tiny structural units called the atoms, and it is anything that has a mass and occupies space, The...
Density of matter, Life applications of density, What does density mean?, How is density calculated?
Each substance has its density, The density is a physical property of the matter as each element and compound has its density, and it varies with the temperature and the pressure.