a barometer is a form of:

Barometer



noun
1.
(វេជ្ជសាស្ត្រ) ឧបករណ៍សំរាប់វាស់ស្ទង់សម្ពាធបរិយាកាស
ENGLISH MEANING
noun
1.
An instrument for determining the weight or pressure of the atmosphere, and hence for judging of the probable changes of weather, or for ascertaining the height of any ascent.