Activity B (continued from previous page) 4. Measure: Return the block to the cabinet and drag out the large sphere. The volume of a
sphere is calculated using the following formula:
VSphere = 473/3
The symbol it represents the number pi, which is about 3.14. The letter r stands for the
radius of the sphere, which is the distance from the center of a sphere to its surface. The
radius is exactly half of the diameter, which is the distance across the sphere. (The
diameter is also equal to the length, width, and height of the sphere.)
A. Place the ruler over the sphere. What is the diameter of the sphere?
B. What is the radius of the sphere?
C. What is the volume of the sphere?

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.

58750.08068 is the answer i think