Arnold kept a water log as a project for his chemistry class. Arnold's family consists of Arnold, his sister, and his parents for a total family size of four. He measured each family member's water usage every day for a week, and found that the family used an average of 457 gal/day. Arnold's city charges $0.223/cgal of water. The unit centigallon (cgal) is used by cities to measure the volume of water used, where 1 cgal is equal to 100 gal. Assuming this average usage continues, how much does Arnold expect his family to pay in a year for water usage?

$ 1487.90 .

Explanation:

Family size = 4

Water usage per member = 457 gal / day .

Water usage for whole family = 457 x 4

Use of water in one year for family = 457 x 365 x 4 = 667220 gal

667220 gal = 667220 / 100 = 6672.20 cgal .

expense per cgal = $ 0.223

Total yearly expected expense = 0.223 x 6672.20

= $ 1487.90

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.

2b2t

explanation:

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