Why a doctor dips the thermometer in a liquid before use? That liquid is actually, alcohol . Since the thermometer is kept beneath the tongue, it needs to be cleaned to use it again. Therefore doctor dips the thermometer in alcohol, which acts as a disinfectant, to clean the thermometer.
Why is a thermometer filled with liquid?
It is a glass thermometer that is also called “spirit filled.” As the internal temperature of the food increases, the liquid inside the stem expands and rises to indicate the temperature on a scale .
Why is thermometer kept under the tongue?
The internal body heat is present under the tongue . So, thermometer is kept under the tongue to get the correct reading of inner body heat. This way we can measure the temperature of our whole body.
What is the liquid present in the thermometer and why is it used?
Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion .
What is the liquid inside the thermometer?
In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.
What is commonly used in liquid filled thermometer?
Mercury is usually used in liquid-filled thermometers, since it remains liquid in the temperature range from –38° to 356°C at normal pressure and up to 750°C with a small increase in pressure, which is attained by filling the bore with nitrogen.
What is normal temp under tongue?
The normal oral temperature for adults is about 98.6° F (37° C) . The normal oral temperature for a child is between 97.6° and 99.3° F (36.4° and 37.4° C). The normal oral temperature for older persons is 98.2° F (36.8° C).
What is the minimum time for which a clinical thermometer is kept below the tongue?
Place the thermometer tip under the tongue. Hold the thermometer in the same spot for about 40 seconds .
Why mercury level does not fall when the thermometer is taken out of mouth?
The mercury does not fall or rise in a clinical thermometer when taken out of the mouth because of the presence of kink . It prevents mercury level from falling on its own.
What are the 2 kinds of liquid found inside a thermometer?
You can identify the liquid in a thermometer based on its color. Silver liquid indicates that the thermometer contains mercury, while red liquid is alcohol to which red coloring has been added. Although uncommon in modern thermometers, a clear color indicates water.
What liquid is in a Galileo thermometer?
Hello Caroline, The liquid in AcuRite Galileo Thermometers is 100% paraffin . The colored bulbs are filled with paraffin and 3.4% dye. The liquid is non-toxic.
What do F and C mean?
C & F in Accounting
(si ənd ɛf) or cost & freight. abbreviation. (Accounting: Commerce) C & F refers to a shipping contract which includes the cost of the goods and the freight, but not insurance. With a C & F contract, the price of the goods includes the cost of the goods and the freight to the named destination.
Why do thermometers use alcohol instead of water?
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. Thermometers rely upon thermal expansion of the liquid in a bulb at the base of a thin glass tube.
Why thermometer should not be shaken rigorously?
Shaking the thermometer hard is what gets the mercury down and ultimately drives it through the constriction so that it rejoins into a single column. In effect, you are making the glass accelerate so fast that it leaves the mercury behind. ... The mercury drifts to the bottom of the thermometer because of its own inertia.
Is it illegal to have a mercury thermometer?
Those days have passed. Since 2001, 20 states have banned mercury “fever thermometers” for medical use , and regulations tighten every year. ... But as of today the federal government has more or less killed the mercury thermometer in the United States—NIST has announced it will no longer calibrate mercury thermometers.
Is commonly used in liquid filled thermometer?
A working liquid which is generally either mercury or alcohol . An inert gas, mainly argon or nitrogen which is filled inside the thermometer above mercury to trim down its volatilization.
