What is equal about equilibrium

Equilibrium is a point of balance in which opposing changes cancel each other. 

Measure 20 ml of water in a graduated cylinder and pour it into a 100-mL beaker. Fill the graduated cylinder to the 20-mL mark with water. Add two drops of food coloring to the water in each container. 

Obtain two glass tubes of equal diameter. Place one tube in the graduated cylinder and the other in the beaker. 

Work with a partner. With the ends of the tubes at the bottoms of their containers, cover the open ends of the glass tubes with your index fingers so that water becomes trapped in the tubes. Simultaneously, move each tube to the other container and release your fingers to release the water. 

Repeat the transfer process about 25 times. Record your observations. 

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