Removing and replacing keys on Acer Aspire laptop's keyboard may require a small screwdriver for precision. Keyboard keys of Acer laptops designed for easy removal and replacement.
How to Measure Air Pollution for a Science Fair Project. Pollution is one among the major problems of todayâs world and air pollution is one root cause of many environmental issues. You can use a magnifying glass for this purpose as the dust particles are too tiny to be seen with necked eye. 2  Count the number of dust particles carefully stuck to the Vaseline in each square and note them down on a note book. 3  Use the number of dust particles sticked to the squares as a proof of air pollution.
The analyzer measures an hourly cycle of ambient air and three standard reference gases with known amounts of CO2. 1  minute 0 through 24: air intake line 1 (last 20 minutes is used) 2  minute 25-44: air intake line 2 (20 minutes used) 3  minute 45-49: high reference gas, which we call W3 (last 2 minutes is used)