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What are three kinds of switching mechanisms used in low-voltage thermostats?
Mercury Bulb, heat-anticipator and a cold-anticipator.
What happen to the mercury when the bulb placed in hot water?
When a thermometer bulb containing mercury is placed in hot water, the mercury inside expands, causing the level of mercury to rise. This expansion of mercury is used to measure the increase in temperature accurately.
Why does mercury level goes down for a very short time when a mercury-in glass thermometer is placed in hot water?
The exterior of the bulb of the thermometer expands first, resulting in the mercury level to go down. After that the mercury in the bulb expands more than the glass bulb, resulting in the subsequent rise of the mercury level.
Why blackening the bulb ensures that the mercury level falls rapidly when the sun ceases to shine?
Blackening the bulb increases its heat absorption, allowing it to cool down more quickly when sunlight is no longer available. This rapid cooling causes the mercury inside the bulb to condense and fall, lowering the mercury level. The blackened surface enhances the bulb's radiation of heat, accelerating the cooling process compared to a non-blackened bulb. Thus, the blackening facilitates a quicker response to changes in temperature.
Why is a thermostat a special kind of thermometer?
A thermostat is not a thermometer, it is a device that routes 24 volts to various circuits according to temperature. There were old fashioned type mercury bulb thermostats but they are very rare today, most thermostats are solid state circuit board type.
Why the level of mercury should change at all when the bulb of the thermometer is brought in contact with another object?
The level of mercury changes in a thermometer when it comes in contact with another object because the temperature of the object affects the temperature of the mercury. Heat transfers between the object and the mercury, causing the mercury to expand or contract, which in turn changes its level in the thermometer.
Pressure bulb can you use a sodium bulb in a mercury fixture?
no
How does a light bulb demonstrate the heating effect?
by the radiation in the filament it throw out heat . this way the bulb demonstrates the heating effect. :D
What is the construction of mercury thermometer?
A typical mercury thermometer consists of a glass tube with a bulb at one end filled with mercury. As the temperature changes, the mercury expands or contracts, causing it to rise or fall in the tube. The temperature is then read based on the level of the mercury within the graduated scale on the tube.
What is the fluid in a fluorescent light bulb?
In a fluorescent light bulb there is usually a drop of mercury. That mercury vaporizes as the bulb warms up and it becomes gaseous, enhancing the electron interaction through the bulb, making it brighter.
What is the formula between length of mercury level and temperature in degree celsius?
There is none. In the case of a thermometer, it will depend on the relative dimensions of the bulb and the capillary tube.
What is the function of constriction in clinical thermometer?
In case of ordinary thermometer if the thermometer is taken out the body whose temperature has been seen, the Mercury would fall down as the bulb gets cooled. But in case of clinical thermometer even after the thermometer has been taken out of the mouth of the patient the level of mercury would be held at the same level though the bulb falls to the room temperature. So doctor could see the temperature liesurely. To bring back the mercury to lowest level we have to give jerks to the thermometer by shaking it.
