Coal mining also requires large amounts of water, which reduces the water for surrounding areas. Designed for advanced undergraduate students, Physical Properties of Materials, Second Edition establishes the principles that control the optical, thermal, electronic, magnetic, and mechanical properties of materials. First, let's check if everyone knows that there is a difference between the words heat and temperature. Write down your ideas from your discussion. What do you think happened to the water when it boiled? Warning: Take care when working with these substances, especially methanol, since it is dangerous. We use it every day of our lives. See more ideas about properties of materials, kindergarten science, science activities. The test tube containing the ethanol or methanol should be suspended in a beaker of tap water, and slowly heated. Water absorption 12. Thermal expansion coefficients are of three types, namely-. Form the paper clip into an S-shape and hang it from the hole in the paper. Physical Properties Defined Properties that define the behavior of materials in response to physical forces other than mechanical •Components in a product must do more than simply withstand mechanical stresses •They must conduct electricity (or prevent conduction), allow heat to transfer (or allow its escape), transmit Below is a concept map for what we have learnt about the properties of materials. A material that conducts heat well is said to have a high heat conductivity. There are some important differences between evaporation and boiling. This chapter builds on the chapters about the properties of materials in Gr. What happened to the temperature of the water when it started to boil? Where, m is the mass of material in Kg. This is because the layer of fibers is thicker, so more fibers to cling to each other. The fibers cling to each other because they have tiny branches on them, that become entangled to give the paper extra strength. What is room temperature? What did it look like when the ice started to melt? Learners could be encouraged to imagine carrying a shopping bag filled with heavy items, that would simply fall through a shopping bag that is too weak or thin. Embedded videos, simulations and presentations from external sources are not necessarily covered Do you think the time required for the water to boil would be longer, shorter or the same? It means the yoghurt tub is heavier, and `pulls' harder on the strip of paper. The material senses the force of an impact on the car and sends an electric charge to activate the airbag. (Supervisory Control and Data Acquisition), Programmable Logic Controllers (PLCs): Basics, Types & Applications, Diode: Definition, Symbol, and Types of Diodes, Thermistor: Definition, Uses & How They Work, Half Wave Rectifier Circuit Diagram & Working Principle, Lenz’s Law of Electromagnetic Induction: Definition & Formula. Materials that can be bent are called flexible. Do you think the time required for the ice to melt would be longer, shorter or the same? Sometimes the cost is purely financial; at other times the cost may be damage to the individual (as in the case of the irresponsible use of medicines and drugs), or to the environment (some examples follow). What are the disadvantages of a car made of gold? Can you think of a few substances that are solids at low temperatures, but have low melting points? Set up your apparatus as shown in the image. Which properties are important when choosing a material for a particular use? Take some of the ice pieces and drop them into the beaker. Here are some guidelines for drawing the graph: Learners should be reminded that the independent variable is the one that was `manipulated'; in this case the total amount of energy added to the water increased with time. Physical and Social Properties of Materials . 8 Matter and Materials. Disadvantages are unfavourable features, as can be seen in the images of plastic in the environment. Plasticity. Boiling is when liquid water changes to water vapour or steam. No. When we keep on increasing the load beyond the limit of elasticity, the material retains it molded state. Refractoriness If, m is the mass of material in Kg, V is the volume of materiel in meter3. Different thermometers from different batches might also give slightly different readings. In order for water to boil it needs to be heated. Punch a hole at both ends of each paper strip. Look carefully at the picture below. 1. This may help them to understand the concept of specific heat later on. Before starting the investigation, divide the class up into groups in which they will perform the investigation and get learners to discuss the following questions first in their group to revise concepts from Gr 6. How would you test how strong a material is? Have you ever had your temperature taken? These properties determine how these different materials are used. But, in boiling, the liquid needs to be heated to reach its boiling point. FALSE: Two alternative TRUE statements are possible: A scientist wants to determine the boiling point of an unknown liquid. This will make the liquid inside the thermometer contract. This is a good opportunity to introduce the notion of fair testing: As many variables as possible should be kept the same: length of the plastic strips, method of fastening the weight to the plastic strips, etc. You could let the learners cut the paper into strips of 20 x 5 cm each, or you could do this beforehand to save time. Unit of αA is per oC. Color, density, and thermal conductivity are examples of physical properties. Specific gravity 7. (Learner must indicate this temperature on the graph. Ice (the solid form of water) melts at a temperature of 0°C. However, practically there may be observed some difference. Can you see anything special? Materials are most of all the objects and therefore materials have its own properties. Do you remember learning about the state changes in previous grades? The water will boil at the same temperature. Learners should write a conclusion stating the boiling point of water that they determined from this investigation, for example, "From this investigation, it can be concluded that the boiling point of water is 100°C. To understand the properties of material explore the article! Learners could be encouraged to look for signs of these treatments. Huge amounts of land are destroyed when mining coal. Which of the above properties would be important if you were choosing a material for making the wires used for distribution of electricity (shown in the next photo)? Take a measurement of the water temperature before you start heating the water. Most plastics melt easily because they melt at relatively low temperatures. Water boils at a temperature of 100°C when the air pressure equals 1 atmosphere. Say why you think it is this substance. Play an interactive game based on the melting points of solids. Just select the materials that you want to compare by toggling the checkbox in the first row, and then choose “Compare Selected”. Note: Once all the ice has melted, the temperature of the water begins to rise. Gases are compressible as a result. http://planetearthherald.com/top-10-environmental-issues/. Since we have no real measure of the energy added to the water, but since we do know that the energy was added at a constant rate, we can use the time that the water was heated as our independent variable. [1 mark]. Why do you say so? When we want to measure temperature we use a thermometer. It does not have any unite. The conclusion is that although a gold car may seem like a nice idea, it is not practical or safe or fuel efficient. It is denoted by ‘σ’. The right side of the graph, where the slope is positive, shows that the temperature was going up. 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