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Why does a mercury-in glass thermometer first drop slightly when placed in boiling water?
Wiki User
∙ 14y ago
When placed in boiling water, the materials comprising the thermometer respond in the order in which the heat penetrates them. As the heat first permeates the glass cylinder, the cylinder expands, enlarging the bore. For the moment until the Mercury is also heated, the constant volume of mercury fills the expanded bore to a slightly lower depth. When the heat reaches the mercury and it also expands, its volume to increase, and the liquid depth rises in the bore.
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoAt first only the outer glass of the thermometer gets hot and expands. The Mercury at first does not heat up and so it does not expand. This creates room for the Mercury and it drops down. The reading on the thermometer is only accurate when both the glass and Mercury are at the same temperature.
Wiki User
∙ 13y agoAs soon as you place the thermometer heat from the hot water first comes in contact with the glass surface of the thermometer which will expand resulting in a greater volume of the bore (capillary which holds mercury) and the level of mercury descends at first..As the heat from hot water reaches mercury,it expands too, which is followed by volumetric expansion of mercury, an increase in the level of mercury results.
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Why should a clinical thermometer not be sterilize in boiling water?
Because clinical thermometer have a very small range. (20 to 45 degrees Celsius at most) and if placed in boiling water, the water being 100 degrees will cause damage to the thermometer.
Why is a thermometer placed in a stevensons screen?
it is because it is white
What is the purpose of a clinical thermometer?
A clinical thermometer is used to measure the body temperature. It is usually placed under the tongue, armpit, or rectum. Under the tongue is normally where it's placed.
Invisible electromagnetic radiation was discovered with what-?
It was discovered with a thermometer placed under the sun rays beyond the red end of the spectrum.
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Water Temperaure cools
What are the Sources of error in distillation?
boiling chips are not added to the distillation flask. the thermometer bulb is placed in the boiling liquid. the water to the water-jacketed condenser is not turned on.
Why should a clinical thermometer not be sterilize in boiling water?
Because clinical thermometer have a very small range. (20 to 45 degrees Celsius at most) and if placed in boiling water, the water being 100 degrees will cause damage to the thermometer.
Is there a difference in taste between steaming and boiling a live lobster?
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What change takes place in the liquid inside a thermometer when the thermometer is placed into something cold?
The liquid in thermometers contracts when placed in something cold (and expands when placed in something hot.)
Why is a thermometer placed in a stevensons screen?
it is because it is white
How does an ear thermometer measure the temperature?
An ear thermometer should be placed carefully in an ear to measure the temperature. The temperature is then taken by an infrared mechanism in the thermometer.
Where is a thermometer normally placed in a house?
A thermostat for heating or a thermometer for air temperature is typically placed on an inside wall (not outside wall), and away from heating vents or direct sunlight.
Where should a thermometer be placed to get the real temperature outside?
On a wall that faces north, which is largely in the shade. An outdoor thermometer placed anywhere that sunlight can fall directly on it will be wildly inaccurate.
What is the purpose of a clinical thermometer?
A clinical thermometer is used to measure the body temperature. It is usually placed under the tongue, armpit, or rectum. Under the tongue is normally where it's placed.
How is accuracy of a thermometer improved?
A Thermometer's accuracy can be improved if it is placed in an area where there is not an object that touches it that can influence a temperature shift.
Why should not a hot thermometer be placed in ice water?
Because it will bust.
What is the correct temperature of a whole turkey when thermometer placed in breast?
165
