Organisms, or living things are made of tiny particles that can join together and make larger structures. Largest to smallest

From largest to smallest the order is as follows

Organism

Organ Systems

Organ

Tissue

Cell

Explanation:

Every living organism on this planet is made up of tiny cells. These tiny cell group together to form tissue. A group of tissues make an organ. Group of organ forms organ system and a group of organ systems is known as an organism.

Hence, from largest to smallest the order is as follows

Organism

Organ Systems

Organ

Tissue

Cell

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.