Question

what is barometer?????​

Answer 1

$<marquee behavior =move bgcolor =white > <h1>hello♥️</h1 ></marquee >$

A instrument used to measure atmospheric pressure is called barometer.

Answer 2

${\huge {\mathfrak {Answer :-}}}$

➡️ An instrument measuring atmospheric pressure, used especially in forecasting the weather and determining altitude is termed as a barometer.

That's it..