Ascientist is sitting in her living room and hears the wind rushing past her front door.

based on her knowledge of bernoulli's principle, what does the scientist know even without opening the door?

the air outside has less volume than the air inside.
there is less air pressure outside the door than inside the door.
the air outside has more mass than the air inside.
there is more air pressure outside the door than inside the door.

I think the second choice but I might be wrong

B

Explanation:

There is less air pressure outside the door than inside the door.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.