Age range: 7–13Time: 30 minutes setup + 2–3 days observationConcepts: air pressure, weather, fluids Goal Build a simple barometer to see pressure rise and fall with changing weather. Materials Glass jar (wide mouth) Balloon or plastic wrap Rubber band Tape Drinking straw Index card or paper for scale Marker Safety Use glass carefully; adults should …

Bottle Barometer: Forecasting with Air PressureRead More »

  Osmosis is a process in which different concentrations of solutions move through semi-permeable membranes. The transfer occurs from the highest concentration to the lowest. Osmotic pressure is a term used to explain the force with which the molecules transfer from the solution of higher concentration into the solution of lower concentration. Osmosis occurs throughout …

Demonstration of How Osmosis WorksRead More »