Temperature Conversion: A Complete Guide
Subject: Science & Math | Level: Grade 5-8 (JNV/Sainik School)
English: Temperature is a physical quantity that expresses hotness and coldness. It is measured with a thermometer. In science and daily life, we use different scales like Celsius, Fahrenheit, and Kelvin to represent these values. Understanding how to switch between them is vital for school exams and competitive tests.
Understanding the Scales
1. Celsius (°C): Used globally for weather and clinical purposes. Water freezes at 0°C and boils at 100°C.
2. Fahrenheit (°F): Primarily used in the United States. On this scale, water freezes at 32°F and boils at 212°F.
3. Kelvin (K): The SI unit of temperature used in scientific calculations. It has no negative values.
Conversion Formulas
| Conversion Type | Formula |
|---|---|
| Celsius to Fahrenheit | °F = (°C × 9/5) + 32 |
| Fahrenheit to Celsius | °C = (°F - 32) × 5/9 |
| Celsius to Kelvin | K = °C + 273.15 |
Step 1: Multiply by 9/5 → 37 × 1.8 = 66.6
Step 2: Add 32 → 66.6 + 32 = 98.6°F
Sample Questions with Solutions
Solution:
Step 1: Use the formula: °F = (°C × 9/5) + 32
Step 2: Substitute the value: °F = (25 × 9/5) + 32
Step 3: Calculate: °F = (25 × 1.8) + 32 = 45 + 32 = 77
Answer: 25°C = 77°F
Solution:
Step 1: Use the formula: °C = (°F - 32) × 5/9
Step 2: Substitute the value: °C = (98.6 - 32) × 5/9
Step 3: Calculate: °C = 66.6 × 5/9 = 66.6 × 0.5556 = 37
Answer: 98.6°F = 37°C (Normal body temperature)
Solution:
Step 1: Use the formula: K = °C + 273.15
Step 2: Substitute the value: K = 0 + 273.15
Step 3: Calculate: K = 273.15
Answer: 0°C = 273.15 K (Freezing point of water)
Solution:
Step 1: Use the formula: °C = (°F - 32) × 5/9
Step 2: Substitute the value: °C = (100 - 32) × 5/9
Step 3: Calculate: °C = 68 × 5/9 = 68 × 0.5556 = 37.78
Answer: 100°F = 37.78°C (approximately 38°C)
Solution:
Step 1: Use the formula: °C = K - 273.15
Step 2: Substitute the value: °C = 300 - 273.15
Step 3: Calculate: °C = 26.85
Answer: 300 K = 26.85°C (approximately 27°C - room temperature)
Quick Exam Tips
- Boiling point of water = 100°C / 212°F
- Freezing point of water = 0°C / 32°F
📚 Keep Learning!
Essential for JNV, Sainik School, and School Exams.

