Air containing water vapor rises in the atmosphere because it is less dense than surrounding dry air. As warm air rises, it cools, allowing water vapor to condense into clouds, influencing weather patterns.
Category: Class 6 Science
NCERT Solutions and Important Questions for class 6 Science for CBSE exams 2020-2021.
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Other examples of cooling effects include sweating, which cools the body through evaporation; the use of ice packs for injuries; and the cooling sensation of menthol in products like toothpaste and cough drops.
Clothes dry slowly on a rainy day due to high humidity levels. The air is saturated with moisture, reducing the rate of evaporation. This prevents water from evaporating efficiently from the fabric, causing slower drying.
If milk is spread out on a plate instead of water, evaporation would occur, but it would be slower. Milk contains fats and proteins that affect evaporation rates compared to pure water.
You can change the state of water by adjusting temperature and pressure. Heating water turns it into steam (gas), while cooling it forms ice (solid). Reducing pressure can also facilitate evaporation and freezing.
Oxygen and carbon dioxide are crucial gases for life. Oxygen is essential for respiration in living organisms, while carbon dioxide is a byproduct of respiration and is used by plants during photosynthesis for growth.
Chapter 7 explores temperature and its measurement, discussing different temperature scales, the concept of heat, and methods for measuring temperature using various instruments. It emphasizes understanding temperature’s role in daily life and scientific experiments.
The difference arises from using different temperature scales: 37.0 °C (Celsius) converts to approximately 98.6 °F (Fahrenheit). These scales have different zero points and intervals, but both represent the same normal human body temperature.
Digital thermometers use heat sensors, typically thermistors or infrared sensors, to detect temperature changes. These sensors convert thermal energy into electrical signals, which are then processed and displayed as a temperature reading on the screen.
Digital clinical thermometers are electronic devices used to measure body temperature accurately and quickly. They feature a digital display, typically utilize heat sensors, and provide readings in Celsius or Fahrenheit, offering a safer alternative to mercury thermometers.