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What is an Extensive Property?
Grade Level:
Class 12
AI/ML, Physics, Biotechnology, FinTech, EVs, Space Technology, Climate Science, Blockchain, Medicine, Engineering, Law, Economics
Definition
What is it?
An extensive property is a property of matter that depends on the amount of matter present in a system. If you change the quantity of the substance, this property will also change.
Simple Example
Quick Example
Imagine you have a small cup of chai. The volume of chai in the cup is an extensive property. If you pour that chai into a bigger glass, the volume of chai remains the same, but if you add more chai, the total volume increases. So, the volume changes with the amount of chai.
Worked Example
Step-by-Step
Let's say you have a small box of ladoos. Each ladoo weighs 50 grams.
1. You have 2 ladoos in the box. The total mass is 2 ladoos * 50 grams/ladoo = 100 grams.
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2. Your friend adds 3 more ladoos to the box. Now you have 2 + 3 = 5 ladoos.
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3. The new total mass is 5 ladoos * 50 grams/ladoo = 250 grams.
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4. Since the total mass changed when the amount of ladoos changed, 'mass' is an extensive property.
Answer: The total mass of ladoos is an extensive property.
Why It Matters
Understanding extensive properties is crucial in fields like Engineering and Biotechnology for designing systems and processes, such as calculating the total energy required for a chemical reaction. In Climate Science, it helps model the total amount of greenhouse gases. Future scientists and engineers use this daily!
Common Mistakes
MISTAKE: Thinking extensive properties are always about 'size'. | CORRECTION: While size (like volume) is often extensive, properties like internal energy or number of moles are also extensive, even if they don't directly describe physical dimensions.
MISTAKE: Confusing extensive properties with intensive properties. | CORRECTION: Remember, extensive properties DEPEND on the amount of matter, while intensive properties DO NOT depend on the amount of matter.
MISTAKE: Believing that if you divide an extensive property, it becomes intensive. | CORRECTION: Dividing two extensive properties (like mass/volume to get density) results in an intensive property, but the original extensive property itself doesn't change its nature.
Practice Questions
Try It Yourself
QUESTION: Is the total number of students in your school an extensive property? | ANSWER: Yes
QUESTION: You have a 1 kg bag of rice. Is the total weight of the rice an extensive property? What happens to this property if you add another 500g bag of rice? | ANSWER: Yes, it is an extensive property. If you add another 500g bag, the total weight will increase to 1.5 kg.
QUESTION: A chemist has a beaker with 100 mL of a solution. The total energy stored in this solution is 50 Joules. If the chemist pours another 50 mL of the *same* solution into the beaker, what can you say about the new total energy of the solution? Is total energy an extensive property? | ANSWER: The new total volume is 150 mL. Since total energy is an extensive property, it will increase. Assuming the energy is proportional to volume, the new total energy would be 75 Joules (50 J / 100 mL * 150 mL). Yes, total energy is an extensive property.
MCQ
Quick Quiz
Which of the following is an extensive property?
Temperature
Density
Mass
Boiling point
The Correct Answer Is:
C
Mass depends on the amount of matter present. If you have more of a substance, its mass will be higher. Temperature, density, and boiling point do not depend on the amount of matter.
Real World Connection
In the Real World
When ISRO launches rockets, engineers meticulously calculate the total mass of the rocket and its fuel. This total mass is an extensive property, directly affecting how much thrust is needed. Similarly, in your kitchen, when your mother makes a big pot of biryani, the total amount of rice, vegetables, and spices (their masses and volumes) are all extensive properties.
Key Vocabulary
Key Terms
PROPERTY: A characteristic of matter | MATTER: Anything that has mass and takes up space | VOLUME: The amount of space an object occupies | MASS: A measure of the amount of matter in an object | SYSTEM: A specific part of the universe being studied
What's Next
What to Learn Next
Great job learning about extensive properties! Next, you should explore 'What is an Intensive Property?'. Understanding intensive properties will help you compare and contrast them with extensive properties, giving you a complete picture of how we classify matter's characteristics.
