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Why is mercury rarely used in thermometers that take body temperatures?
Mercury is a toxic heavy metal. The possibility of breakage and the subsequent release of mercury into the body, or into the environment, means that mercury usage has gradually been phased out in consumer thermometers. Laboratory thermometers often still contain mercury, since it's useful over a wide range of temperatures. This isn't so critical in medical thermometers, since the body temperature of someone who isn't actually dead is almost certainly going to be no more than 10 degrees from 37 Celcius.
Why there is kink in clinical thermometer?
In a normal clinical thermometer, the mercury moves up and down the capillary tube as the temperature changes and thus if you removed it from contact with the patient the reading would steadily fall as it cooed. As you need a clinical thermometer to give you a reading of the patients temperature even after it has been removed from the patient, you need to stop the mercury shrinking back into the reservoir. The 'kink' breaks the connection between the mercury in the capillary tube and the reservoir so the reading given is accurate. On the other hand before it can be used again the mercury in the capillary tube has to be vigorously shaken back into the reservoir.On a point of interest, clinical thermometers are getting very rare because they have been phased out due to concerns regarding mercury poisoning should they break in use.
What is the function of thermometer mercury?
The Mercury expands with temperature. Since expansion is linear over the normal range of a mercury-driven thermometer, the level of mercury within a little glass tube indicates the current temperature of the thermometer's immediate environment.
How does a psychrometer work?
A psychrometer has two thermometers first off, second it can work by the bulb of the wet-bulb thermometer that has a cloth covering the moistened with water. Air is than blown over both thermometers. Because the wet -bulb thermometer is cooled by evaporation, its reading drops below that of the dry- bulb thermometer and dont let stalkers stalk you .. plus LOOK UP SKRILLEX ON YOUTUBE!! AWESOME!!!
What is the function of mercury in thermometer?
The mercury expands with temperature. Since expansion is linear over the normal range of a mercury-driven thermometer, the level of mercury within a little glass tube indicates the current temperature of the thermometer's immediate environment.
Why is Mercury used in thermometers instead of alcohol?
Mercury thermometers have advantages over alcohol thermometers. The liquid is visible making the results easy to read. It expands at a regular interval. It measures temperature quickly and accurately.
Why is mercury rarely used in thermometers that take body temperatures?
Mercury is a toxic heavy metal. The possibility of breakage and the subsequent release of mercury into the body, or into the environment, means that mercury usage has gradually been phased out in consumer thermometers. Laboratory thermometers often still contain mercury, since it's useful over a wide range of temperatures. This isn't so critical in medical thermometers, since the body temperature of someone who isn't actually dead is almost certainly going to be no more than 10 degrees from 37 Celcius.
Why was cuniform preffered over picture writing?
it was quicker .
To get an accurate measurement on a thermometer what do you do?
- Read the temperature over the meniscus (for mercury thermometers)- Avoid the parallaxe error- Respect the depth of immersion thermometer- Don't use thermometers with defects (ex. air bubbles)- Wait a reasonable time the setting of indication for the thermometer
What element is a liquid metal used in a thermometer?
Mercury is a liquid metal that is used in thermometers.
Do modern thermometers contain mercury?
Yes. Most standard lab thermometers are either alcohol or mercury filled.
What element liquid metal that used to be used in thermometers?
Mercury
What element is a liquid in thermometers?
In the past, Mercury was used in ALL thermometers, oral or rectal for human use. But Mercury poses health risks. So they changed the internal workings to electronic components.As an historical point of view, when I grew up, all thermometers contained mercury enclosed in thin glass. If the thermometer was dropped, it could easily break. Mercury when spilled is attracted to it's own droplets. So although the mercury spilled out, it formed little round silver balls that could easily be pushed together, separated again, and pushed back together---all with one finger! Children delighted in "playing" with it, until the droplets rolled around in enough dust that they did not attract to each other as well. Then, we pushed the remaining balls onto a piece of paper and threw it into the regular garbage, which was then burned outdoors or in the coal furnace. After 1980s, they began making thermometers without mercury from fears about mercury toxicity and mercury poisoning. (But plenty of people now over 50 years old never experienced bad effects from playing with mercury droplets.)
Why is red led preffered over other leds?
red led is rare and from WW2
Why is HDI preffered over the traditional gross product?
To see how other countries are doing.
Why are hollow electric poles preffered over solid poles?
They both weigh and cost less.
Why use of alcohol is preferred over mercury in thermometers?
Alcohol is less expensive and the compounds formed from oxides of Mercury are poisonous while alcohol is less problematic.
