Explanation
Temperature change in Celsius scale = Temperature change in Kelvin scale = 27 K
Zero kelvin = – 273°C (absolute temperature). As no matter can attain this temperature, hence temperature can never be negative on Kelvin scale.
Thermoelectric thermometer is used for finding rapidly varying temperature.
Due to evaporation cooling is caused which lowers the temperature of bulb wrapped in wet hanky.
The boiling point of mercury is 4000C. Therefore, the mercury thermometer can be used to measure the temperature upto 3600CC.
Solids, liquids and gases all expand on being heated, as a result density (= mass/volume) decreases.
As coefficient of cubical expansion of liquid equals coefficient of cubical expansion of vessel, the level of liquid will not change on heating.
In summer alcohol expands, density decreases, so 1 litre of alcohol will weigh less in summer than in winter.
water has maximum density at 40C
Since coefficient of expansion of steel is greater than that of bronze, hence with small increase in it’s temperature the hole expands sufficiently.
On heating the system; x, r and d all increase, since the expansion of isotropic solids is similar to true photographic enlargement.
Since, the coefficient of linear expansion of brass is greater than that of steel. On cooling, the brass contracts more, so it gets loosened.
The densest layer of water will be at bottom. The density of water is maximum at 4°C. So, the temperature of bottom of lake will he 4°C.
In vapour to liquid phase transition, heat liberates.
Pressure inside the mines is greater than that of normal pressure. Also, we know that boiling point increases with increase in pressure.
Mass and volume of the gas will remain same, so density will also remain same.
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