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Why thermometer have a bulb like structure at the end but not spherical?
Wiki User
∙ 10y ago
The bulb at the bottom of a thermometer is a reservoir of the temperature sensitive material, traditionally Mercury. If you just had one narrow column of mercury, it would not change its height very much in response to changes of temperature, and therefore it would be very hard to read the temperature accurately off such a thermometer, but when you have a reservoir of mercury which gives you much more mercury and hence much more change in the total volume of the mercury in response to a change in temperature, then the mercury rises and falls to a much greater degree, and is easier to read.
The reservoir shape can be whatever the manufacturer wants it to be, though spherical is not really an optimal choice because a sphere is the minimum surface area to volume shape, which is the exact opposite of what you want if the goal is for the mercury to equilibrate its temperature rapidly with the environment.
Wiki User
∙ 10y ago
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Describe the structure of a thermometer?
The thermometer consists of a very fine glass tube having a very small bore and is called capillary tube. At one end of capillary tube a very thin glass bulb is provided. The bulb is filled with mercury( most of the times) or alcohol The other end of capillary tube is sealed. The capillary tube is protected by a thick glass tube called stem. On the stem are made markings. These markings are called graduations or degrees.
What did the first thermometer look like?
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Describe the structure of a thermometer?
The thermometer consists of a very fine glass tube having a very small bore and is called capillary tube. At one end of capillary tube a very thin glass bulb is provided. The bulb is filled with mercury( most of the times) or alcohol The other end of capillary tube is sealed. The capillary tube is protected by a thick glass tube called stem. On the stem are made markings. These markings are called graduations or degrees.
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What did the first thermometer look like?
it looked like a modern thermometer
What did first thermometer look like?
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