The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

When a septic tank backs up a goes in to clean it out