Table of Contents
- 1 What is inside a laboratory thermometer?
- 2 Does thermometer measure air?
- 3 Do laboratory thermometers have kink?
- 4 Which one is filled in the bulb of a thermometer?
- 5 Do thermometers have mercury in them?
- 6 How do you know if a thermometer has mercury in it?
- 7 Where does a clinical thermometer measure body temperature?
- 8 How big is a standard lab thermometer tray?
What is inside a laboratory thermometer?
Liquid-in-glass thermometers are made of sealed glass and contain a fluid, usually mercury or red alcohol, whose volume changes relative to its temperature. The liquid expands as the temperature rises, rising in the tube and indicating the temperature.
Does thermometer measure air?
Air temperature is measured with thermometers. Common thermometers consist of a glass rod with a very thin tube in it. When you are measuring the air temperature, be sure to have the thermometer in the shade. If the sun shines on the thermometer, it heats the liquid.
Is there a vacuum inside a thermometer?
The space above the mercury may be filled with nitrogen gas or it may be at less than atmospheric pressure, a partial vacuum. He invented the mercury-in-glass thermometer (first widely used, accurate, practical thermometer) and Fahrenheit scale (first standardized temperature scale to be widely used).
How do you get air out of a thermometer?
To resolve the issue, use the cooling method described above to cool a portion of the bulb until a large bubble of gas enters it. Remove the thermometer from the cooling container, and hold it upright with the bulb side up, and begin to gently tap it against the palm of your hand.
Do laboratory thermometers have kink?
Usually, the function of the kink in the thermometer is to break the flowing connection of mercury in the capillary and the bulb area at the lower end of thermometer. In laboratory thermometer, the temperature is measured continuously to note temperature change. Therefore, a laboratory thermometer does not have a kink.
Which one is filled in the bulb of a thermometer?
Mercury is a metal which exists in liquid form at room temperature . It is a shiny liquid metal with a high coefficient of expansion. It also has a high boiling point which is suitable for measurement of higher temperatures. Therefore, mercury is the metal used in the bulb of the thermometer.
Do thermometers show room temperature?
Check the temperature on the thermometer. A general room temperature measurement is around 70–75 °F (21–24 °C). A digital thermometer will display the temperature on its screen and will be the most accurate.
Can a thermometer Tell room temperature?
The only way to really measure the temperature of a room in degrees is with a thermometer. Most people find a room between 72 and 76 degrees to be just right, which is why it is called room temperature.
Do thermometers have mercury in them?
The oldest thermometers used are mercury in glass. Newer thermometers include non-mercury liquids in glass and digital and electronic devices that use sensors to measure temperature. Thermometers that check body temperature in the ear, across the forehead, or have a digital display do not contain mercury.
How do you know if a thermometer has mercury in it?
How can I tell if my thermometer has mercury? Mercury is a silver-white to gray substance. If your thermometer is filled with a red liquid, your thermometer contains red dyed alcohol or mineral spirits and not mercury. These are safer alternatives to mercury fever thermometers.
Why is kink not used in laboratory thermometer?
Answer. Thermometer has to measure change continuously the mercury level has to go up and down countinuously so there is no kink in a lab thermometer. A lab thermometer has to measure change continuously the mercury level has to go up and down countinuously so there is no kink in a lab thermometer.
Can a thermometer be used for anything other than temperature?
Since clinical thermometers can’t be used to measure temperature other than the human body, we need a special type of thermometers for other purposes. A laboratory thermometer is used for measuring temperatures other than the human body temperature.
Where does a clinical thermometer measure body temperature?
Figure 1: Clinical thermometer with a mercury bulb and a capillary tube with a kink in it. Working of the clinical thermometer: This thermometer must be kept clean and sterilized before taking the temperature of the patient. The thermometer is placed inside the mouth of the patient to measure the body temperature.
How big is a standard lab thermometer tray?
36 x 43cm (14 x 17″) polystyrene trays fit standard lab bench drawers and are ideal for organizing a variety of items. 14 lengthwise rests protect, store and keep thermometers and other long, fragile instruments organized and accessible. Rest are interrupted by deeper compartments which make removal…
What are the functions of an air thermometer?
Also includes a Type K thermometer function for contact or air temperature measurements from -4 to 1832°F (-20 to 750°C). Advanced functions include Capacitance, Frequency and Duty…