Why is glass thermometer thin?
Why is glass thermometer thin?
Glass has a very low coefficient of thermal expansion. This is the reason why thermometer bulb or for a matter of fact entire thermometer is made up of glass. Due to low coefficient of thermal expansion, when the thermometer undergoes a large temperature change it will have minimal change in dimensions.
Why glass is used in thermometer?
The fluid/glass thermometer is the most popular thermometer used around the world to measure body temperature. It consists of a sealed glass tube with a small internal diameter (like a lumen) connected to a reservoir. Increasing the temperature expands and pushes up the fluid in the reservoir and tube.
What is wrong with glass thermometer?
Since 2001, 20 states have banned mercury “fever thermometers” for medical use, and regulations tighten every year. It’s a neurotoxin—exposure can cause tremors, partial blindness, deafness, memory loss, and many, many other problems—and, if mercury does spill, it’s very hard to clean up.
Why does a thermometer have a thick glass stem?
Bulb – Carries the liquid in the thermometer. It has a thin glass wall for effective heat transmission between the liquid and body whose temperature is taken. Glass stem – Is a thick wall surrounding the capillary bore. It also serves as a magnifying glass for easy reading of scale.
Why the glass bulb is made of thin glass?
Its made of glass with very thin walls to allow the heat from sample being measured to reach the liquid quickly for fast response and quick reading (improves the quickness of response by the thermometer). — has a vacuum above the liquid column so there is no resistance to the expanding liquid.
What liquid is in a glass thermometer?
mercury 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.
Which thermometer is more sensitive?
gas thermometers
Thus gases expand more than liquids, i.e., gas will expand more than liquids for the same tiny change in temperature. Hence, gas thermometers are more sensitive than liquid thermometers.
Is a broken thermometer dangerous?
Liquid mercury vaporizes (evaporates) at room temperature causing elevated levels of mercury in indoor air. Even the small amount of mercury from a broken thermometer can cause harm, especially to children, unless it is properly cleaned up and removed.
How do you increase the linearity of a thermometer?
The range of a liquid-in-glass thermometer is limited by the length of the thermometer and can be increased by: increasing the diameter of the capillary – this means that the liquid will not expand as far along the tube per degree rise in temperature.
Why the thermometer has thin walls on its bulb?
The wall of bulb is made thin in laboratory thermometer because if the wall of bulb is made thick , it cannot respond quickly to the change in temperature as glass is poor conductor of heat so that reading may not be exact. Mercury thermometer expands and contracts according to the rise or fall in temperature.
Why is the bulb of a thermometer made of thin glass?
the bulbs of thermometers are made of glass with very thin walls so that the heat from sample which is being measured reaches the liquid ( mercury) quickly for fast response of the thermometer Rate! Rate! Not sure about the answer? Not sure about the answer? Learn more with Brainly! Learn more with Brainly! Having trouble with your homework?
Why are liquid in glass thermometers more sensitive?
In addition, they tend to have a greater sensitivity to changes in stem temperature, which is a fundamental limitation in their use. These thermometers also have different capillary and bulb dimensions than mercury LiG thermometers, causing differences in response time and immersion characteristics.
How is the structure of a thermometer made?
Structure: 1 The thermometer is made relatively small so that it is portable and cheap. 2 The liquid is contained in a thin-walled glass bulb. The bulb is made relatively larger than its bore to contain more of… 3 The narrow bore of the capillary tube is uniform. The round glass stem around the capillary tube is made thick. It acts… More …
Why does a thermometer have a narrower bore?
Small expansion of the liquid in the liquid bulb will cause a big change in the length of the liquid thread in the capillary tube as it is made narrow. The narrower the bore, the higher the sensitivity. The range is limited by the freezing and boiling points of liquid.
Why is the bulb of thermometer made of thin glass?
First, the bulb of a thermometer is not thin glass. It is not as thick as the tube, but this is because they make the tube really thick so the bulb can be thick when it is blown from the tube in one piece. So why not make the bulb from metal? Because the seal between the metal and glass would have problems with leaking.
In addition, they tend to have a greater sensitivity to changes in stem temperature, which is a fundamental limitation in their use. These thermometers also have different capillary and bulb dimensions than mercury LiG thermometers, causing differences in response time and immersion characteristics.
Structure: 1 The thermometer is made relatively small so that it is portable and cheap. 2 The liquid is contained in a thin-walled glass bulb. The bulb is made relatively larger than its bore to contain more of… 3 The narrow bore of the capillary tube is uniform. The round glass stem around the capillary tube is made thick. It acts… More
Small expansion of the liquid in the liquid bulb will cause a big change in the length of the liquid thread in the capillary tube as it is made narrow. The narrower the bore, the higher the sensitivity. The range is limited by the freezing and boiling points of liquid.