Why do animals need a tail?
Many animals can boast of having a tail: animals and birds, amphibians, and fish. But we will tell...
What is a barometer and what is it for?
There are many ways to get information about the world. You can, for example, just look out your...
What is a hygrometer and what is it for?
The most important indicators that determine environmental conditions are temperature and humidity. Every household today has a thermometer...
What is an echo sounder and how does it work?
A modern sea or river vessel cannot do without navigational instruments, one of which is a sonar. With...
What is a heliograph? Why do I need it?
The word “heliograph” means “writing the sun” in Greek. Currently, there are two types of instruments bearing this...
What is a psychrometer and what is it for?
A thermometer attached to a window frame is usually sufficient for the average person to determine the weather...
What is tin and what does it do?
Tin, a soft white metal, was one of the first metals that humans learned to work with. Scientists...
What is bronze and what is it made of?
Bronze is an alloy of copper with other metals, less commonly nonmetals. The most common name for bronze...
What is nitrogen and what is it used for?
Nitrogen is a chemical element with atomic number 7. It is an odorless, tasteless, and colorless gas. Therefore,...
What is sand, and what is its chemical composition?
Natural sand is a loose sedimentary rock that has formed over millions of years through weathering. Wind, rain,...