《Theworldofscience》PPT课件(第3课时)

Write a report of the experiment and share it with the class
This experiment is designed to prove whether air pressure really exists. I prepared the materials, including a boiled egg, a glass bottle whose neck is a bit smaller than the egg, and some hot water to do this experiment. First, I removed the shell of the egg. Then, I carefully poured some hot water into the bottle, and shook the bottle gently. After a few minutes, I poured out the hot water. Just at the same time, I quickly placed the egg on top of the bottle. After the experiment, I can draw the conclusion that air pressure indeed exists, and it is very powerful. It is the force of the air that pushed the egg into the bottle.
Writing help
How to write an experiment report: ①.Introduction: Introduce the aim of the experiment. ②.Main body: Describe the materials used in the experiment and explain the procedure. ③.Conclusion: Report the results and what you have learnt.
that a boiled egg can be swallowed by a hot glass bottle in the
right experiment. Through this my own experience, I have
learned that so long as we just study hard, observe and think
Fill in the table
Introduction
Main body conclusion
The aim of the experiment
This experiment is designed to a)_f_i_g_u_re__o_u_t _w_h_y__th_e__b_o_il_e_d_egg is swallowed by the hot glass.
Read the instructions(on page 35) for the experiment and answer the questions.
1. What will the results of this experiment be?
After the egg is sucked into the mouth of the bottle, it is slowly absorbed into the bottle and falls to the bottom.
Unit 3 The world of science
第3课时
Goals
1. Read an experiment report and understand the structure of an experiment report. 2. Practise an experiment report with the help of the given structure. 3. Improve your own ability of writing
Home work checking
Benjamin Franklin was one of the Founding Fathers of the United States.Apart 1._fr_o_m__ being a successful statements,he was also a 2._c_re_a_t_iv_e_(create) scientist an inventor. Benjamin Franklin 3.___f_le_w___(fly)a kite during a storm in 1752.he raised the kite with a piece of sting 4.__ti_r_ed__(tire) to it.A metal key was attached ti the sting.A flash of lighting hit the kite,and electricity was conducted through the sting to the key.Franklin then touched the key and got 5.____an____ electric shock. Generations of schoolchildren have been amazed by his 6.___b_r_a_v_er_y___(brave)and scientific approach to 7.__lo_o_k_i_n_g_(look)for the truth.However,new research suggests that the story may be fiction instead of a fact.More than one scientist has questioned 8.__w__h_at__ really happened.They all agreed that if Franklin had 9.___a_c_tu_a_l_ly___(actual) touched the key,he would certainly have died from electric shock. In science,facts should 10.b_e__p_ro_v_e_d_(prove) by experiments and research,and we should not always believe everything we read or hear-- even if it is a great story.
Fill in the blanks
The experiment is designed to prove 1.__w_h_e_t_h_er_ air pressure really exists. At the beginning of the experiment, I prepared the materials, 2.__in_c_l_u_d_in_g_(include) a boiled egg, a glass bottle 3._w_h_o_s_e_ neck is a bit smaller than the egg, and some hot water. With all the things 4._p_r_e_p_a_re_d_(prepare), the experiment began. First, I removed the shell of the egg. Then, I 5._c_a_r_e_fu_l_ly_(careful) poured some hot water into the bottle, and 6.___sh_o_o_k__(shake) the bottle gently. After a few minutes, I poured out the hot water. Just at the same time, I quickly placed 7.___th_e__ egg on top of the bottle. To my 8._a_m__a_ze_m__e_n_t(amaze), the egg squeezed into the bottle at once. 9.__A_f_t_e_r _ the experiment, I can draw the conclusion 10.__t_h_a_t _ air pressure indeed exists, and it is very powerful. It is the force of the air that pushed the egg into the bottle.
carefully, we can figure out the secret of some scientific
knowledge.
Discussion
Why does the egg get pushed inside the bottle?
The answer is all about air pressure. If you first set the egg on an empty bottle, the air pressure inside the bottle matches the air pressure outside, so nothing happens. But when you pour some hot water into the bottle, it causes the air inside to heat up and expand rapidly, so some of the air in the bottle gets out. When the egg is put on the bottle, the air pressure outside of the bottle pushes the egg into the bottle. The result is an unbalanced force – the force of the air pushing on the egg from outside the bottle is greater than the force of the air pushing up on it from inside the bottle. As a result, the egg is pushed into the bottle.
5)Quickly put the egg on top of the bottle. The result and what we After the experiment, I can draw the conclusion that
have learned
d)Байду номын сангаас
After the experiment, I can draw the conclusion that it is true
I prepare b)_s_u_ch__m_a_t_e_ri_a_ls__a_s_a_b_o_i_le_d__e_g_g_, _a_g_l_a_ss__b_o_tt_le__a_n_d_h_o_t__w_a_te_r_____
to do this experiment Procedure c)_1_)R__em__o_v_e_t_h_e_s_h_e_l_l _o_f _th_e__e_g_g_. ___________________________ __2_)_C_a_r_e_fu_l_ly__p_o_u_r_s_o_m_e__h_o_t _w_a_t_e_r _in_t_o_t_h_e_b_o_t_tl_e_._____________ The materials used __3_)_S_h_a_k_e_t_h_e_b_o_t_tl_e_g_e_n_t_ly_.______________________________ and the procedure __4_)_P_o_u_r_th_e__h_o_t_w_a_t_e_r.__________________________________
2. What can you learn from this experiment?
Through my own experience, I have learned that as long as we study hard, observe and think carefully, we can figure out the secret of some scientific facts.