What is Extensive Properties?

S7-SA5-0078

Grade Level:

Class 12

AI/ML, Physics, Biotechnology, FinTech, EVs, Space Technology, Climate Science, Blockchain, Medicine, Engineering, Law, Economics

Definition

What is it?

Extensive properties are features of a system that depend on the amount of matter present. This means if you change the quantity of the substance, the value of its extensive property will also change.

Simple Example

Quick Example

Imagine you have a small cup of chai. Its volume is less than a big pot of chai. Here, volume is an extensive property because it changes with the amount of chai you have.

Worked Example

Step-by-Step

Let's say you have a 1 kg bag of rice.
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Step 1: The mass of this bag is 1 kg. Mass is an extensive property.
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Step 2: Now, you buy another identical 1 kg bag of rice.
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Step 3: You combine both bags. The total amount of rice is now 2 kg.
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Step 4: The total mass of the rice is now 2 kg. It has changed because the amount of matter (rice) increased.
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Answer: This shows mass is an extensive property, as its value changed when the amount of substance changed.

Why It Matters

Understanding extensive properties is crucial in fields like Engineering, where you design structures based on the total weight of materials, or in Medicine, when calculating dosages based on a patient's body mass. It helps scientists and engineers measure and control systems accurately.

Common Mistakes

MISTAKE: Thinking extensive properties are always 'big' values. | CORRECTION: Extensive properties just depend on the amount, whether that amount is small or large. For example, the mass of a tiny feather is still an extensive property.

MISTAKE: Confusing extensive properties with intensive properties. | CORRECTION: Remember, extensive properties change with the amount, while intensive properties (like temperature or density) do NOT change with the amount.

MISTAKE: Assuming all properties are extensive. | CORRECTION: Not every property is extensive. For instance, the boiling point of water is 100 degrees Celsius, whether you have a cup or a bucket of water. Boiling point is an intensive property.

Practice Questions

Try It Yourself

QUESTION: If you have 500 grams of flour and then add another 250 grams, what happens to the total mass of the flour? Is mass an extensive property? | ANSWER: The total mass becomes 750 grams. Yes, mass is an extensive property because its value changed when the amount of flour changed.

QUESTION: You have a 2-liter bottle of water. If you pour half of it into another container, what is the volume of water left in the original bottle? Is volume an extensive property? | ANSWER: 1 liter of water is left. Yes, volume is an extensive property because its value changed when the amount of water changed.

QUESTION: A chemist prepares a solution with a certain amount of salt dissolved in water. If they double the amount of solution (keeping the concentration the same), what happens to the total number of salt particles? Is the number of particles an extensive property? | ANSWER: The total number of salt particles will double. Yes, the number of particles is an extensive property because it increases with the amount of solution.

MCQ

Quick Quiz

Which of the following is an extensive property?

Temperature

Density

Volume

Boiling Point

The Correct Answer Is:

Volume is an extensive property because it depends on the amount of substance. Temperature, density, and boiling point are intensive properties as they do not change with the amount.

Real World Connection

In the Real World

When you order groceries online from apps like Zepto or Swiggy Instamart, the 'total weight' or 'total number of items' in your cart are extensive properties. The delivery charge might even depend on the total weight, showing how these properties impact real-world logistics and economics.

Key Vocabulary

Key Terms

EXTENSIVE PROPERTY: A property that depends on the amount of matter present | INTENSIVE PROPERTY: A property that does NOT depend on the amount of matter present | MASS: The amount of matter in an object | VOLUME: The amount of space an object occupies

What's Next

What to Learn Next

Great job understanding extensive properties! Next, you should learn about 'Intensive Properties.' This will help you clearly distinguish between properties that depend on the amount of substance and those that don't, which is key for advanced science concepts.