A condenser
A condenser
A condenser
its not
Biotechnological industries.
The bicycle wasn't discovered, it was invented. A man with an idea had someone build a contraption. The design was somewhat useful, so after a while someone else thought of improvements, and had a slightly different machine built. Later, someone else thought of more improvements, built yet another version. And so it went, until we got the bike of today.
The design helps make a sketch of how it will work and the main bluprint
they can be useful in the future annd when we run out of supplies
It is making the design useful, comfortable and suited to the person that is useing that item ,
Same reason anything is improved - to make it better. Stronger, lighter, more useful...
Oxygen (O2) not only use in our daily life but also it is useful in industries because in industries it use in the stage of burning, making chemicals and at very huge amount . uhprbnkmerf
Short answer Yes. Petrol is useful for running a engine, and extremely dangerous if misused.
The engine will not run without a supply of petrol so you would think it is useful.