Observe someone making a meal in your home. You can make something yourself! As the food is prepared, collect dat for two examples of changes in matter. Use the Changes in Matter guide to determine if your examples are physical or
chemical changes. Your answer should include a description of each food preparation, as well as
evidence for which
type of change it is. You can use this format:
Example 1:
Type of Change:
Evidence:
Example 2:
Type of Change:
Evidence:

Please help me.
Will give

answer; economic order quantity;

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.