The Production of Buoyancy Indicator

1. Teaching Objectives:

1. Understand that objects that sink also experience the force of buoyancy, and learn the reasons for an object's buoyancy or sinking in a liquid.

2. Understand what a buoyancy device is and the principle of its construction.

3. By making floating and sinking objects, students practice their hands-on ability.

4. By researching information, understand the principles of a submarine's descent and ascent.

II. Preparation of Teaching Aids:

A small medicine bottle (with a stopper), scissors, water, a syringe or rubber bulb pipette, a plastic bottle with a mouth larger than the diameter of the medicine bottle, a glass bottle with a mouth larger than the diameter of the medicine bottle, an rubber film, rubber bands, etc.

Section Three: Teaching Process:

1. The conditions for the buoyancy and sinking of objects

Demonstrate and operate: Teachers and students find common items around them, judge their floating or sinking in water based on their life experience, and then verify them one by one by putting them into the water.

Discussion: Some objects sink to the bottom of the water, some objects float to the surface and eventually float on the water, and some objects eventually suspend in the water. Does the object that sinks, such as coins and stones, not feel the buoyancy of the water?

Students discuss and conclude that objects sink because the buoyant force is less than the gravity, while objects float because the buoyant force is greater than the gravity.

2. Demonstrate and introduce the buoyancy and sinking of the buoy

Teacher Introduction: An object that can both float and sink according to the conditions of floating and sinking is called a buoyancy device.

The teacher demonstrates two methods of changing the buoyancy of a small medicine bottle to make it float or sink, as shown in the diagram, to stimulate students' interest.

Question: By observing and guessing, what do you think changes to make the small bottle float or sink?

Students guess: change buoyancy or change gravity.

Hint: Observe how the submersible achieves descent and ascent by carefully examining the amount of water in the small medicine bottle during the ascent and descent process.

Discussion results: By changing the weight of the small medicine bottle by adding or reducing the amount of water in the bottle, it can achieve buoyancy and sinking.

The teacher briefly introduces the concept of air pressure, allowing students to understand why squeezing the bottle or pressing the rubber film can make water enter the small medicine bottle.

3. The Production Process of Buoyancy Indicator

① Use scissors or other tools to make a small hole in the center of the bottle cap of the small medicine bottle, which is convenient for the water to enter and exit.

Step 2: Remove the bottle cap, pour in the appropriate amount of water, then replace the cap, and use a dropper or pipette to drop a small amount of water, ensuring that the small bottle just floats to the surface about 1-2mm.

Pour water into the large plastic bottle, but do not fill it to the top.

④ Put the small bottle into the plastic bottle and check again whether the small bottle just floats on the surface.

Cover the large plastic cap, squeeze the bottle body to observe whether the small bottle can sink or float. If not, adjust the amount of water in the small medicine bottle or the plastic bottle until the experiment is successful.

Take another glass bottle and fill it with water, making sure that the water level is about 2cm from the lid.

Step 7: Place the adjusted small bottle into the glass bottle, and secure the rubber film with an elastic band at the mouth of the glass bottle to ensure its airtightness.

Press the rubber film with your fingers and observe whether the small bottle can sink or float. If it cannot, adjust the amount of water in the small bottle or the water in the glass bottle and the rubber film until the experiment is successful.

4. Students engage in hands-on activities with teacher guidance.

5. Group presentation of experimental results, exchange of production experiences, teacher's comments

After the demonstration of the results, the teacher guides students to exchange the main problems encountered in the process of making and the methods of overcoming difficulties, learning from each other. The teacher pays attention to encourage the students' enthusiasm for making and affirm the students who have made unremitting efforts and repeated experiments.

Company Profile

 Chili Toy Factory was established in 2007. After ten years of unremitting efforts, our company has gradually matured; We are a member of the National Ministry of Education Teaching Equipment Industry Association and a backbone enterprise of Zhejiang Province Teaching Equipment. The company has been awarded the "Heavy Contract and Credit-Keeping" unit by Yiwu City for three consecutive years, and in 2014, it was designated by the Zhejiang Provincial Education Bureau as the "Culture and Popularization Experiment Equipment Fixed-point Production Unit".

AiGou Company is a high-tech enterprise that integrates modern scientific research and development, educational equipment, curriculum design, teaching resource integration, and technical services. AiGou, with its high-tech products, is a professional enterprise in the development and production of popular science experiment teaching materials in the country. The products are exported to Europe and the United States.
After years of accumulation, the company has initially reached a certain scale. In terms of technological innovation, the company has professional design personnel engaged in the development of scientific education products and the upgrade and replacement of existing products. In terms of production, management, and service, the company strictly implements the standards of the ISO9001 international quality assurance system. In marketing, the AiGou products have been entered into many provinces and cities in the country and enjoy a good reputation. For many years, it has provided high-quality, advanced, professional series of modern teaching equipment and professional equipment research and development custom services for the educational community. With excellent, high-quality professional talents and perfect after-sales service, it ensures the excellence of product quality and establishes a good corporate image. The scientific education physical series, chemical series, photovoltaic, wind energy, geography, biology, art and other products of Qiquan have successfully won bids in the education bureau tenders for many times.

 Chilvog Company continues to adhere to the business philosophy of 'quality first, service diligent, and honesty in conduct', providing excellent equipment and high-quality service for school teaching and research. We are willing to work diligently with new and old friends at home and abroad, join hands to progress, and devote our utmost efforts to education, contributing to the cause of education.

 ChiliBuy ensures that every child can keep up with the times!!!