Omar Khalid
Plastic is a synthetic material that exhibits both intensive and extensive properties. Intensive properties are characteristics that do not depend on the amount of the substance, such as colour, melting point, and electrical conductivity. Extensive properties, on the other hand, vary with the quantity of the material and include mass, volume, and weight. The distinction between these properties is crucial for accurately identifying and characterising substances in scientific contexts. For example, while the colour of plastic remains unchanged regardless of its quantity, its mass and volume will differ depending on how much plastic is present.
| Characteristics | Values |
|---|---|
| Definition | Extensive properties are physical quantities whose values are proportional to the size of the system they describe, or to the quantity of matter in the system. Intensive properties, on the other hand, are physical quantities whose values do not depend on the amount of substance measured. |
| Examples of Extensive Properties | Mass, Volume, Weight, Energy |
| Examples of Intensive Properties | Temperature, Density, Colour, Melting Point, Boiling Point, Solubility, Electrical Conductivity, Refractive Index, Hardness |
| Identification | To identify whether a property is intensive or extensive, take two identical samples of a substance and put them together. If the property doubles (e.g. twice the mass, twice as long), it's an extensive property. If the property is unchanged, it's an intensive property. |
Explore related products
What You'll Learn
Plastic's electrical conductivity is poor, an intensive property
The electrical conductivity of a substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors. The molecular structure of most polymers consists of long chains or large molecules with limited charge mobility, resulting in poor electrical conductivity.
Intensive properties are physical quantities whose values do not depend on the amount of substance being measured. They are intrinsic to the substance and remain constant regardless of its size or extent. Examples of intensive properties include temperature, density, refractive index, and hardness. For instance, the boiling temperature of a substance is an intensive property. Water, for example, always boils at 100 °C at atmospheric pressure, regardless of the quantity.
In contrast, extensive properties are physical quantities that are dependent on the size or extent of the system they describe. They vary with the amount of matter present. Examples of extensive properties include mass and volume. If you have two identical samples of a substance and combining them doubles a certain property, such as mass or volume, it is an extensive property.
The electrical conductivity of plastics is an intensive property. While the addition of conductive fillers can enhance their conductivity, the base polymers or plastics themselves exhibit poor electrical conductivity due to their molecular structure. This poor conductivity is an inherent characteristic of the material, regardless of its quantity or dimensions.
To improve the electrical conductivity of plastics, various conductive additives can be introduced during the manufacturing process. These additives, such as carbon black, metal powders, and metal-coated oxides, create pathways for energy conduction. By controlling the type and amount of additive used, the conductivity of the plastic can be fine-tuned to specific levels. These conductive plastics have found applications in electronic devices, communication equipment, and computer devices, showcasing the ability to customize their electrical properties for specific requirements.
Plastic Pots: Good or Bad for Indoor Plants?
You may want to see also
Explore related products
Intensive properties do not depend on the quantity of matter
Intensive properties are physical properties of matter that do not depend on the quantity of matter. They are instead dependent on the type of matter in a sample. For example, the boiling point of water is always 100 degrees Celsius, whether you have two or 2000 litres of water.
Extensive properties, on the other hand, do depend on the amount of substance present. Examples of extensive properties include mass, volume, and energy. These properties change as the quantity of the substance changes. So, if you have two boxes of the same material, one with a capacity of four litres and the other with a capacity of ten litres, the larger box will have more matter.
Intensive properties can be used to help identify a sample because they are intrinsic to the substance and do not change according to the amount of the substance or the conditions. For example, the density of water is approximately 1g/mL whether you consider a drop of water or a swimming pool. The density of a substance is an intensive property because there is a narrow range of densities across samples. No matter what the initial mass was, the densities are essentially the same.
Other examples of intensive properties include temperature, refractive index, density, hardness, pressure, colour, melting point, boiling point, electrical conductivity, and physical state at a given temperature.
The ratio of two extensive properties of the same object or system is an intensive property. For example, the ratio of an object's mass and volume, which are two extensive properties, is density, which is an intensive property.
Plastic Monomers vs DNA: The Strength Showdown
You may want to see also
Explore related products
Volume, mass, and weight are extensive properties
The terms "intensive and extensive quantities" were introduced into physics by German mathematician Georg Helm in 1898 and by American physicist and chemist Richard C. Tolman in 1917. According to the International Union of Pure and Applied Chemistry (IUPAC), an extensive property is a physical quantity whose value is proportional to the size of the system it describes or the quantity of matter in the system.
Volume, mass, and weight are all examples of extensive properties. Volume is an extensive property because it measures the amount of space an object occupies. The volume of an object can be increased or decreased depending on the amount of matter present. For example, a pitcher and a glass both contain milk. The pitcher holds approximately two quarts, while the glass holds about 8 ounces of milk. The same milk is in each container, but the only difference is the amount of milk in each container.
Mass is also an extensive property. The mass of an object is a measure of the amount of matter that an object contains. A small sample of a certain type of matter will have a small mass, while a larger sample will have a greater mass. For instance, a drop of water has a smaller mass than a swimming pool filled with water.
Weight is another example of an extensive property. Weight is defined as the force on an object due to gravity. The weight of an object depends on its mass and the gravitational force acting on it. As mass is an extensive property, weight is also an extensive property as it depends on the amount of matter present.
Extensive properties are useful for describing a sample, but they are not very helpful for identifying it because they can change according to sample size or conditions. For example, the volume, mass, and weight of a sample can vary depending on the amount of matter present.
Creative Ways to Decorate Plastic Drawer Organizers
You may want to see also
Explore related products
Intensive properties are crucial for characterising and identifying substances
Intensive properties are physical characteristics of a substance that remain constant regardless of the amount of the substance. They are crucial for characterising and identifying substances as they provide unique identifiers that are independent of the quantity of the substance. For example, the boiling point of water is always 100°C at 1 atmosphere (atm) of pressure, regardless of the amount of water. This makes intensive properties highly reliable for substance identification.
Extensive properties, on the other hand, are physical characteristics that depend on the amount of substance present. They are not typically used for identification purposes as they change with the quantity of the substance. For instance, the mass of a substance is an extensive property, and a larger sample will have a greater mass than a smaller sample.
Intensive properties include temperature, density, colour, melting point, boiling point, and solubility. These properties are inherent to the substance and do not vary with the quantity or conditions. For example, the density of gold is always approximately 19.32 g/cm³, allowing for its identification regardless of the mass of the sample.
Extensive properties include mass, volume, size, and energy. These properties are additive for subsystems, meaning they increase or decrease in proportion to the system's size or mass. For example, if you have two identical containers of milk, one a pitcher and the other a glass, the volume of milk will differ between the two containers.
Understanding the distinction between intensive and extensive properties is essential for accurately characterising and identifying substances in scientific contexts. Intensive properties provide consistent and reliable identifiers, while extensive properties help describe the sample but can vary with changes in quantity.
Plastic vs Wooden Tinkertoys: Are They Compatible?
You may want to see also
Explore related products
Density is an intensive property
The density of a substance is an intensive property. This means that it is a physical property that does not depend on the amount of the substance or the size of the system. In other words, the density of a substance will remain the same regardless of how much of it there is. For example, the density of water is approximately 1g/mL whether you consider a drop of water or a swimming pool. The mass of the water in both cases is different, but the density remains the same.
Extensive properties, on the other hand, are physical properties that do depend on the amount of substance or the size of the system. Examples of extensive properties include mass, volume, weight, and energy. If you have two identical samples of a substance with an extensive property, and you put them together, the property will double. For example, if you have two boxes made of the same material, one with a capacity of four litres and the other with a capacity of ten litres, the box with the larger capacity will contain more matter.
Intensive properties, by contrast, do not change when you double the sample size. They are properties that are dependent only on the type of matter in a sample and not on the amount. Other examples of intensive properties include temperature, colour, melting and boiling point, pressure, and electrical conductivity. For instance, the boiling temperature of water is 100 °C at a pressure of one atmosphere, regardless of the quantity of water.
The density of a substance is calculated as its mass per unit volume. This means that it is the ratio of two extensive properties: mass and volume. The ratio of two extensive properties of the same object or system is always an intensive property. For example, if you have two identical samples of a substance with the same mass but different volumes, the density will differ. However, if you were to double the amount of substance, the density would remain the same.
Attaching Plastic Window Boxes: The Ultimate Guide
You may want to see also
Frequently asked questions
Intensive properties are physical properties that do not depend on the amount of substance being measured. For example, temperature, density, colour, melting and boiling point.
Extensive properties are physical properties that depend on the amount of substance being measured. For example, mass, volume, weight, and energy.
Take two identical samples of a substance and put them together. If the property doubles (e.g. twice the mass, twice as long), it's an extensive property. If the property is unchanged, it's an intensive property.
Plastic is a poor electrical conductor. Its electrical conductivity is an intensive property as it does not depend on the amount of plastic.
![24 x 48 Inch UHMW Polyethylene Sheets, 1/8 Inch Thick Ultra High Molecular Weight White Plastic Sheet [for Home, Industrial]](https://m.media-amazon.com/images/I/319QA9QuX1L._AC_UL320_.jpg)
