1. Why Alcohol thermometers are not used for measuring high temperature?
2. Write any two general effects of heat energy with example.
3. Find the temperature at which Fahrenheit and Celsius scale give the same reading.
4. Define Bimetallic strip and Ventilation.
5. Why do birds puff up their feathers in winter?
Answers
Answer:
pls marke as the brainliest
Explanation:
An alcohol thermometer cannot be used to measure the temperature of boiling water . Justify. Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. Pure ethanol freezes at -115 degrees C, while mercury freezes at -38 degrees C.
For example if ice (solid) is heated it changes its state to water (liquid) and if this water is further heated it becomes water vapour (gas). Conversely when a gas loses heat energy it changes into a liquid and on further cooling it freezes into a solid.
Celsius and Fahrenheit are the same at – 40 degrees since the scales converge.
a strip consisting of two metals of different coefficients of expansion welded together so that it buckles on heating: used in thermostats, etc
the provision of fresh air to a room, building,
“A bird's body heat warms the air between its feathers,” Marra explains. “So birds fluff up in the cold to trap as much air in their feathers as possible. The more trapped air, the warmer the bird
1. Why Alcohol thermometers are not used for measuring high temperature?
An alcohol thermometer cannot be used to measure the temperature of boiling water . Justify. Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. Pure ethanol freezes at -115 degrees C, while mercury freezes at -38 degrees C.
2. Write any two general effects of heat energy with example.
Heat energy may bring about chemical changes in a substance: When we heat substances, the heat energy breaks the original bonds between the elements and new products with new bonds are formed. For example, if marble (calcium carbonate) is heated, it turns into calcium oxide and carbon dioxide.
3. Find the temperature at which Fahrenheit and Celsius scale give the same reading.
Celsius and Fahrenheit are the same at – 40 degrees since the scales converge.
4. Define Bimetallic strip and Ventilation.
strip consisting of two metals of different coefficients of expansion welded together so that it buckles on heating: used in thermostats, etc.
Ventilation, or breathing, is the movement of air through the conducting passages between the atmosphere and the lungs. The air moves through the passages because of pressure gradients that are produced by contraction of the diaphragm and thoracic muscles
5. Why do birds puff up their feathers in winter?
A bird's body heat warms the air between its feathers,” Marra explains. “So birds fluff up in the cold to trap as much air in their feathers as possible. The more trapped air, the warmer the bird.”