Reuben wanted to test the Law of Conservation of Mass using different stages of water. He first measured the mass of a beaker with three ice cubes. After one hour, he measured the mass of the beaker with liquid water. Reuben observed that both measurements were almost the same. What would be a good explanation for Reuben observation?

A: The amount of water as ice increased when the water turned into liquid.
B: The mass of the beaker increased with the change in temperature, so it balanced the amount of water in the change of state.
C: There is no mass in water as solid or liquid, so only the beaker mass was measured.
D: The initial amount of water in the solid state (ice) was the same amount of water in the liquid state measured at the end, except for some water that might be evaporated.

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i believe it is 40–40–20%

explanation:

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.