Step One - Get 3 volunteers.
Step Two - One by one, get each volunteer to blow into the peak flow meter as hard as they can. After each volunteer has done so clean the device with alcohol.
Step Three - Record results.
Step Four - Get the volunteers to stay outside for four minutes. Use a clock or stopwatch to for this step. Also, measure the temperature using a thermometer.
Step Five - Once four minutes are over, get each volunteer to blow into the peak flow meter and clean with alcohol as done in Step Two.
Step Six - Record results.
Step Seven - Put the volunteers in a hot area or room for exactly four minutes. Also, measure the temperature using a thermometer.
Step Eight - Get each volunteer to blow into the peak flow meter. After use clean with alcohol.
Step Nine - Record results.
Step Ten - Form a conclusion.