Solids, Liquids And Gases: Units
Overview
Every equation in physics only works when the quantities going into it are measured in the right units. Mixing up grams with kilograms or centimetres with metres is one of the fastest ways to lose marks on a calculation, and it happens more often than you might expect.
This lesson gives you the complete set of SI and derived units that appear across the Solids, Liquids and Gases section of the Edexcel IGCSE. You will practise converting between related units, learn how to spot when a value needs converting before substitution, and build the reflexes that keep unit errors out of your exam work.
Objectives
- Use the following units: degree Celsius, Kelvin (K), joule (J), kilogram (kg), kilogram/metre3 (kg/m3), metre (m), metre2 (m2), metre3 (m3), metre/second (m/s), metre/second2 (m/s2), newton (N) and pascal (Pa)
- Use the following unit: joules/kilogram degree Celsius (J/kg C)
Mind map
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Flashcards
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Solids, Liquids And Gases: Units. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What is the SI unit of pressure? A) N B) Pa C) J D) kg/m3 Answer: B
- How many cubic centimetres are in one cubic metre? A) 100 B) 1000 C) 10 000 D) 1 000 000 Answer: D
- What is 50 degrees Celsius in kelvin? A) 223 K B) 323 K C) 373 K D) 50 K Answer: B
- Which pair of units both measure the same quantity? A) Pa and J B) Pa and N/m2 C) K and J D) kg and N Answer: B
- What is the unit of specific heat capacity? A) J/kg B) J/(kg K) C) J/(kg degC) D) Both B and C Answer: D
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Practice Mock Questions
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