Why is the bulb of a clinical thermometer made of thin glass?
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 is the bore of a clinical thermometer narrow?
In a mercury thermometer, it prevents the mercury from dropping immediately back into the bulb when the thermometer is removed from the patient. That constriction may or may not be present in an alcohol thermometer.
Why is lightbulb glass so thin?
Incandescent bulbs are typically made of very thin glass in order to avoid excessive energy loss when the bulb is at higher temperatures.
Why is glass used to make 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.
Why does a thermometer have an oval shaped glass stem?
The heat brings the glass at the zone where the same is directed to flow temperature. Under the influence of gravity the portion of the stem below the heated zone pulls out the heated zone forming the glass into what looks like a very thin taffy strand.
How does a bulb thermometer work?
This type of thermometer is a long glass tube filled with liquid that rises and falls as the temperature changes. Glass bulb thermometers work because liquids, such as water, alcohol, or mercury, expand slightly when the temperature rises. If the liquid is trapped in a narrow tube, it has nowhere to go but up.
What is a glass bulb thermometer?
The liquid in glass thermometer, is the most commonly used device to measure temperature and it is inexpensive to make and easy to use. The liquid in glass thermometer has a glass bulb attached to a sealed glass tube (also called the stem or capillary tube).
Why does a bulb glow?
The filament of an electric bulb glows because of the heating effect of electric current. As the current passes through the bulb it heats the filament which gives off light. The filament then heats up and becomes red-hot as a result of this it begins to glow, turning electrical energy into light energy.