4.9 teachers, student activities, as well as two paper plates, paper plates, 2. a simple parallel but apart for about 3-4 cm from the air into the space between the two sheets of photos below. Observe what happens.
4.9 Students will do two sheets of paper targets. To take a second sheet of paper held parallel but roughly 3-4 cm and then blow into the channel between the two sheets of paper. As shown below Observe what happens
4.9 teacher student activities blow double paper sheet by sheet of paper to the 2 plate holding parallel แต่ห่ work about 3 - 4 cm, then. To blow into the channel between the two sheets of paper, as shown in the picture below. Observe what happened.