Heat
Boojho & Paheli's Questions Answered
Heat is a form of energy that makes things warmer. Understanding temperature and heat transfer helps us in daily life. Let's explore common questions about heat!
This happens because our sense of hot and cold is relative. Your hands were at different temperatures before touching the water.
Our skin senses temperature differences, not absolute temperature. If your left hand was cold and right hand was warm, the same water will feel different to each hand.
Use a thermometer to measure the actual temperature of the water instead of relying on your sense of touch.
Paheli is correct. In India, we use the Celsius scale (°C) for temperature measurement.
Thermometer showing Celsius and Fahrenheit scales
Used in India and most countries worldwide
Water freezes at 0°C and boils at 100°C
Used mainly in the United States
Water freezes at 32°F and boils at 212°F
She need not to be worried because the normal body temperature is approximately 37°C, but it can vary slightly.
Healthy body temperature can range between 36.1°C to 37.2°C (97°F to 99°F). It changes throughout the day and is affected by activity, time of day, and other factors.
Only be concerned if your temperature is:
- Below 35°C (feeling very cold)
- Above 38°C (fever)
Paheli was right to stop him. Clinical thermometers are designed only for measuring body temperature.
- Hot milk can be above 42°C - the maximum limit of clinical thermometers
- The thermometer might break from high temperature
- Mercury (if present) could leak and contaminate the milk
Use a laboratory thermometer that can measure higher temperatures safely.
No, laboratory thermometers are not suitable for measuring body temperature.
Range: 35°C to 42°C
Designed for body temperature measurement
Has a kink to hold the reading
Range: -10°C to 110°C
No kink - mercury falls as temperature drops
Not accurate for body temperature
Laboratory thermometers don't have the kink that holds the mercury in place. As soon as you remove it from your body, the reading will start changing, making it hard to get an accurate measurement.
The mercury level changes due to thermal expansion.
Mercury expands when heated and contracts when cooled. When the bulb touches a warmer object, heat transfers to the mercury, causing it to expand and rise in the tube.
Yes! Heat only flows from a hotter object to a colder object.
Heat naturally transfers from objects at higher temperature to objects at lower temperature. When two objects have the same temperature, there's no net heat flow between them.
When objects at different temperatures come in contact, heat flows until they reach the same temperature. This state is called thermal equilibrium.
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