Top 6 Best Essays on 'Explaining a Household Item' for Grade 8

Question 1. When you give a presentation, addressing the audience is key. How should you address your classmates and teacher when presenting?

Answer:

You should address the teacher and classmates respectfully when speaking in front of the class.

Question 2. After addressing the audience, you must capture their attention. How will you grab attention when introducing a household item?

Answer:

You can start with a rhetorical question, raise a curiosity, or explain how lacking this item can cause difficulties in daily life.

Question 3. Given the topic: "Introduce Different Types of Lamps". Prepare an outline and practice presenting based on it.

Answer:

Start with a broad definition of lamps. Look up the dictionary definition of a lamp. List the different types of lamps based on the fuel used (such as candles, oil, electricity). Mention the various uses of lamps (e.g., lighting lamps, signal lamps, decorative lamps). Each type can have subcategories (for example, signal lamps: motorcycle lamps, car lamps, TV lamps, street lamps, etc.).

Question 4. Introduce different types of slippers.

Answer:

Similar to exercise 3. Look up the dictionary definition of slippers. Explain how slippers differ from shoes and sandals. Discuss the materials used, the structure, types, and categorize slippers based on material or usage.

A. REQUIREMENTS

- Use speaking exercises to reinforce the knowledge and skills of writing an expository essay as learned.

- Encourage students to think confidently and express their ideas.

B. GUIDELINES FOR ANSWERING QUESTIONS AND EXERCISES

I. Prepare at home for the topic: 'Explain a Thermos Flask'.

Guidelines

1. Requirements: Present the uses, structure, principles of heat retention, and how to maintain the thermos flask.

2. Observation and Research

- Identify that the thermos flask is an essential household item.

- Function of the thermos: Keeps the temperature of the liquid inside (maintains water at 70°C for up to 6 hours after being initially filled with boiling water at 100°C).

- Structure:

+ Flask body: What is it made of? How is the body decorated? How does the body protect the inner chamber?

+ Inner chamber (the essential part): To retain heat, what materials are used for the inner chamber and how is it constructed? (two layers of glass with a vacuum in between to prevent heat transfer; the inner glass is coated with silver to reflect heat back in; the neck of the flask is narrow to minimize heat transfer).

- How to properly maintain and use the thermos? What should be avoided when using the thermos?

3. Create an outline

- Organize your points in a logical order for oral presentation.

- Ensure the structure includes three parts: Introduction, Body, and Conclusion.

II. Practicing Speaking in Class

- Practice speaking according to the outline with your group or class.

- Some students will be selected to present in front of the class.

Guidelines

- Based on the prepared outline, present in the order of Introduction, Body, and Conclusion.

- Depending on the content, use analysis, explanation, or statistical methods...

- Adjust your voice (clear pronunciation, appropriate volume, emphasize key points); combine gestures and facial expressions; pay attention to the use of formal address when presenting to classmates and teachers.

- Listen attentively to your peers' presentations, take notes on the teacher's and classmates' feedback, revise your outline, and improve your speaking for next time.

Topic: 'Explaining a Thermos Flask'.

Outline

a. Introduction:

Introduce the concept and role of a thermos flask. The thermos flask is a very common household item in Vietnamese homes and has been a trusted companion for many years.

b. Body:

- Origin: The thermos (or flask) was invented by Scottish physicist and chemist Sir James Dewar in 1892. In 1904, the first thermos bottles appeared on the German market. The flask has a double-layer structure (made of glass, metal, or polymer), with a vacuum between the layers to provide insulation.

- Sizes and brands of thermos flasks: Thermos flasks come in a wide range of sizes, from small ones holding about half a liter to larger ones that hold up to 4 liters, with the most popular size ranging from 1.5 to 2 liters. On the market, Vietnamese-made Rạng Đông thermos flasks are quite reputable, while Chinese imports are cheaper but of inconsistent quality.

- Structure of the thermos flask: The thermos flask works based on the principle of preventing heat transfer, consisting of two parts: the inner chamber and the outer casing.

- The inner chamber is the most crucial part. Made of two layers of glass, with a vacuum between them to prevent heat loss, the inner and outer surfaces are coated with silver to reflect heat back in, while the neck of the flask is designed to be narrow to reduce heat transfer.

- The outer casing, handle, body, and base are often made of thin aluminum or woven bamboo, and nowadays, plastic is commonly used. These materials prevent rust and protect the inner flask. The outer casing comes in various colors such as green, red, purple, and yellow, with decorative patterns. The cap is made from a lightweight wood material covered with a thin fabric layer to ensure insulation.

- Operating principle: The thermos consists of a double-walled glass container. The vacuum between the two layers of glass prevents heat transfer, and both sides are coated with silver to reflect the heat back to the water inside. The flask is sealed with a cap to prevent heat from escaping through convection, thus keeping the water warm for a long time.

- Function: A thermos flask is used to keep water hot for a long period. A good thermos can keep the water from 100°C down to 70°C for 8 to 10 hours.

- Maintenance and usage: To keep the thermos effective, rinse it with hot water before pouring in boiling water. Seal the cap tightly and avoid overfilling, as this may cause heat loss. Keep the thermos out of reach of children to avoid accidents and damage.

c. Conclusion: The thermos flask remains a valuable and familiar companion in everyday life.

Home Preparation

Outline: 'Explaining a Thermos Flask'.

Introduction: Present an overview of the thermos flask and its importance (provide a definition).

Main Body:

- Origin: The thermos flask was invented by a British scientist in 1892.

- Construction: The thermos consists of two main components: the inner flask and the outer casing:

+ The inner flask is made from two layers of glass, with a vacuum in between to prevent heat transfer. The inner and outer surfaces of the flask are coated with silver to reflect heat back into the thermos. The flask is sealed with a cap to block heat loss through convection.

+ The outer casing is usually made of plastic.

- Maintenance and Usage: The thermos should be placed on a wooden frame to keep it secure, stored in a dry, clean place, and kept out of reach of children to avoid accidents with boiling water.

Conclusion: Share your thoughts on the thermos flask.

Assignment: Explain the Thermos Flask.

Suggestions

Your presentation should clearly outline the thermos flask's function, structure, heat retention principle, and maintenance tips. Focus on the various parts that make up this essential household item.

The most critical part of a thermos flask is its inner flask, designed to retain heat. It consists of two glass layers with a vacuum between them to block heat transfer. The inner surfaces of the glass are coated with a thin layer of mercury, which reflects heat back to keep it contained. The thermos' neck is always narrower to reduce heat loss. With this design, a thermos can keep water at 70°C for up to 6 hours after initially being at 100°C. The outer casing, usually made from metal, secures the inner flask and keeps it safe. Be sure to avoid dropping the thermos to prevent it from breaking. To complete this presentation, students should prepare an outline with three main sections: Introduction, Body, and Conclusion, and select appropriate methods for explanation.

Outline:

1. Introduction: Introduce the item being explained

2. Body:

- History

- Structure

- Usage

- Maintenance

- Purpose and Significance

3. Conclusion: Summarize the topic

Sample Essay

The thermos flask is a popular and useful item for keeping liquids hot, found in nearly every household. Thermoses come in various types, made from different materials, and come in different shapes and sizes. Typically, thermoses are cylindrical, standing about 35-40 cm tall, allowing them to remain stable without tipping over.

Structure: The thermos works by preventing the heat of the water from escaping, consisting of two main parts: the inner flask and the outer casing. The inner flask, which is the most important part, is made of two layers of glass. Between the glass layers, there is a vacuum that blocks the transfer of heat. The inner and outer surfaces of the flask are coated with a layer of silver that reflects heat back into the liquid. The neck of the thermos narrows to further reduce heat loss. The thermos cap, which is made of wood or plastic, fits tightly to prevent the escape of steam and the transfer of heat.

The thermos is highly effective at keeping liquids hot. For instance, in six hours, water can remain at 70°C after initially being heated to 100°C, making it ideal for brewing tea, coffee, or other beverages. The inner glass is fragile, so the outer casing serves as protection. Traditionally, the casing was made from bamboo, rattan, iron, or aluminum, but today, many thermoses feature durable plastic casings that are lighter, more aesthetically pleasing, and long-lasting. Many thermoses come with a handle that can be made from plastic or metal, allowing for easy portability.

The thermos lid serves not only as a cap but also as protection, preventing burns from hot water. It fits tightly, either by screwing on a threaded lid or using a snugly fitting wooden cap. Some thermoses even feature a lid that can double as a drinking cup.

To ensure the thermos lasts, store it on a wooden stand in a dry, clean area, away from heat and out of reach of children. Improper storage could lead to accidents, as thermoses retain heat for long periods. One important tip is to handle the lid carefully as it helps maintain the vacuum seal, which contributes to the thermos's heat retention. When pouring hot water into the thermos, do so slowly to allow the inner flask to adjust to the heat. Always secure the lid tightly afterward to ensure it remains effective.

The thermos is a handy and essential tool in every household, often becoming an indispensable part of daily life. Whether it's used by farmers to carry hot tea to the fields or to serve guests at home, the thermos plays an important cultural role in Vietnam, blending both tradition and modern practicality. It symbolizes warmth and hospitality.

Assignment: 'Explaining the Thermos Flask'

1. Requirements

Describe the thermos' function, structure, heat retention mechanism, and maintenance methods.

2. Observations and Research

- Identify the thermos as an essential and commonly used item in every household.

- Purpose of the thermos: Its ability to retain heat (keeping water hot for 6 hours, reducing temperature from 100°C to 75°C).

- Structure:

+ What material is used for the thermos casing?

+ What is the color and design of the thermos?

+ How does the casing protect the inner flask?

+ The inner flask (core of the thermos) is the most crucial component for heat retention. What material is the inner flask made of?

- How should the thermos be maintained and used properly?

- Important tips to remember when using the thermos.

3. Creating an Outline

- Organize the structure of the oral presentation, arranging the introduction, body, and conclusion logically.

+ Plan the estimated time for your presentation.

+ Choose an appropriate method for explaining the topic.

Preparing for the Speaking Lesson: Explaining a Household Item

1. Practice in front of a group or class: adjust your volume, tone, and emphasize key points.

2. Listen to your peers' presentations, take notes, and note feedback from teachers and classmates.

3. Revise and finalize the presentation after receiving constructive feedback.