two mercury manometers, one open-end and the other sealed-end, are attached to an air duct. the reading on the open-end manometer is 25 mm and that on the sealed-end manometer is 800 mm. determine the absolute pressure in the duct, the gauge pressure in the duct, and the

Bthe s the

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

The answer is 4 i don't know if its right let me see.

Hello.the answer is  hydrosphere, geosphere, and biosphere  have a nice day