NCERT Solutions for Class 7 Science Chapter 4
Important NCERT Questions
7th Chapter 4 Heat
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 1
State similarities and differences between the laboratory thermometer and the clinical thermometer.
Share
Similarities:
• Working principle of both the thermometer is same.
• Both are used to measure temperature.
• Both have a thick walled glass tube enclosing a fine uniform bore capillary tube.
• Mercury is used in both thermometers to measure temperature.
• Both have Celsius and Fahrenheit markings.
Differences:
• Laboratory thermometer is used to measure temperature of different objects in factories and laboratory where as clinical thermometer is used to measure the temperature of human beings only.
• Generally, laboratory thermometer has temperature range from −10℃ to 110℃ where as clinical thermometer has temperature range from 35℃ to 42℃.
• Usually laboratory thermometer does not have any constriction where as clinical thermometer has the small constriction near the mercury bulb.
• Laboratory thermometer has to be kept upright while taking the reading where as clinical thermometer can be tilted while taking reading.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-4/
Similarities:
1. Temperature Measurement: Both laboratory and clinical thermometers are instruments used to measure temperature accurately.
2. Display Options: Both types may use mercury or digital displays to show temperature readings.
Differences:
1. Purpose:
– Laboratory Thermometer: Employed in scientific labs to measure a wide temperature range, including extreme hot or cold conditions.
– Clinical Thermometer: Specifically designed to measure human body temperature and commonly used in medical settings.
2. Temperature Range:
– Laboratory Thermometer: Covers a broader temperature range, suitable for various experimental conditions.
– Clinical Thermometer: Typically measures within the human body temperature range.
3. Design:
– Laboratory Thermometer: Longer, with a narrow tube and markings for precise readings.
– Clinical Thermometer: Shorter, with a wider tube, designed for oral, axillary, or rectal use in humans.
4. Accuracy:
– Laboratory Thermometer: Generally more precise, intended for accuracy in scientific experiments.
– Clinical Thermometer: Accurate for measuring human body temperature variations.
5. Handling:
– Laboratory Thermometer: Requires careful handling and is used in controlled lab conditions.
– Clinical Thermometer: Designed for general use by individuals or medical professionals, focusing on ease of handling and sterilization.
In summary, while both measure temperature, laboratory thermometers suit scientific experiments with a wider temperature range, while clinical thermometers are specialized for measuring human body temperature in medical settings.