parts of clinical thermometer
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Answer:
Bulb
The bulb is the basis of mercury thermometers. It is at the bottom and is cylindrical or spherical depending on the artifact. The functionality of the bulb is to store the mercury and is usually made of stainless steel, but can be made of glass as well.
When it comes in contact with the place to measure and the temperature rises, the mercury leaves the bulb and when the temperature descends the mercury low and returns to deposit inside the bulb.
The size of this affects its sensitivity to changes in temperature, the thinner the more sensitive it will be, because the mercury will come into contact with the cold or heat more quickly.
Capillary
The capillary or stem is the tube through which the mercury flows. It is inside the glass body of the thermometer and is connected to the bulb.
It is the route that allows the mercury to travel until reaching the temperature at which the target is in measurement and back to the bulb.
The size of the stem also affects the measurement, because of being long mercury would take longer to fully expand, giving a broader range of temperature.
Body
The body is the glass tube that covers the stem. It is of elongated and triangular shape but the edges are softened, giving them a rounded appearance for a better handling. Usually measures 20 to 30 cm.
It is for this part that has given so many negative replicas to the mercury thermometers, since if it is ingested in considerable quantities can be toxic.
Because the body of glass is considered delicate and very fragile, it is imperative to take care of extremely strong drops or grips, because it could rupture and leak the liquid.
However, the glass is used because it filters the temperature well. One side of this is a magnifying glass, which makes reading easier.
Expansion compartment
The expansion compartment is the space above the stem, where gas and air are deposited while the mercury rises and the place where the mercury will be located in case it is exceeded.
When the mercury reaches the compartment, it means that the thermometer can not expand further and reach higher degrees of temperature.
Scale
The scale includes the marks on the body of the thermometer and indicates the temperature level. Depending on the thermometer you can have ° F or ° C.
Valve
The shrinkage valve is the connector between the bulb and the shank. Because it is narrower than the stem, this valve causes the mercury to slow down; Giving the person the necessary time to read the temperature reached.
clinical thermometer
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expansion chamber click to hear
Space that is taken up by the gas in the capillary bore; it is pushed back as the mercury rises into it.
stem click to hear
Glass tube containing the capillary bore.
capillary tube click to hear
End of the glass tube in which the mercury rises or falls with the temperature; the mercury thermometer tube is filled with gas.
scale click to hear
Divisions of equal length (degrees) marked on the thermometer that constitute the units of measurement.
column of mercury click to hear
Quantity of mercury that is contained in the capillary bore; its height varies with the temperature.
constriction click to hear
Narrowing that prevents the mercury from spontaneously dropping into the bulb as the temperature lowers (the thermometer must be shaken to make it go down).
mercury bulb click to hear
Glass reservoir containing mercury (a liquid metal) that expands and rises in the capillary tube as the temperature rises.