The emitted or absorbed heat which changes the state of the substance but does not cause any change in temperature is called latent heat. This energy is used for phase transitions, such as melting or boiling, without altering the substance’s ...
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Water on mountains starts boiling at a temperature less than 100°C due to the lower atmospheric pressure at higher altitudes. The reduced pressure decreases the boiling point of water, causing it to boil at temperatures below 100°C.
Due to impurities, the boiling point (B.P) of a liquid increases. This phenomenon is known as boiling point elevation and is a colligative property. The presence of impurities lowers the vapor pressure of the solution, requiring a higher temperature for ...
Mercury is generally used in thermometers because it has high density. Its high density allows for precise and easily readable measurements due to the small size of the thermometer’s scale. Additionally, mercury’s low freezing point and wide liquid range make ...
The point at which the Fahrenheit temperature is double the Celsius temperature is -40 °F. At this temperature, -40 °F is equal to -40 °C.
A body absorbs the most heat when it is black and rough. Black surfaces absorb more radiation across a broader spectrum of wavelengths compared to lighter surfaces, and rough surfaces have more surface area for radiation absorption.
The room can be cooled by releasing compressed gas. When compressed gas is released, it expands and absorbs heat from the surroundings, thereby lowering the temperature of the room. This principle is used in air conditioning and refrigeration systems.
Running a fan in hot weather gives comfort because our sweat evaporates faster. The moving air increases the evaporation rate of sweat from our skin, which cools the body through the process of evaporative cooling.
When salt is added to water, the boiling point increases and the freezing point decreases. This phenomenon is due to the colligative properties of solutions, where the presence of a solute affects the boiling and freezing points of the solvent.
The temperature of the Sun’s surface is approximately 6000K. This value refers to the photosphere, the Sun’s outer layer that emits the light we see.