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A student claims that the thermometers are useless because a thermometer always registers its own temperature. how would you respond?
It is true that thermometers always registers its own temperature.When thermometers are in contact with a respective body heat is exchanged between the thermometer and the body.After some time they are in equilibrium state.As both of their temperature are now the same, temperature of thermometer is registered equal to that of the body as a result.
What else can I help you with?
What is thermometer in chemistry and its use?
Laboratory thermometers are used to measure temperatures or temperature changes with a high degree of precision. They are made of metal or glass and strengthened through processes such as thermal tempering or annealing.
What Type of thermometer uses mercury therefore considered unsafe to use?
The type of thermometer that uses mercury is called a mercury thermometer. These thermometers are considered unsafe because mercury is a toxic substance that can pose health risks if the thermometer breaks and spills. Due to these safety concerns, many countries have phased out or banned the use of mercury thermometers in favor of safer alternatives like digital or alcohol-based thermometers.
Why are thermometers important when conducting a science experiment?
Because we need to find the temperature of the surroundings
Why is there a need for us to shake the clinical thermometer prior to each use?
If the clinical thermometer is a mercury based thermometer, it needs to be shaken down prior to each use. This is because there is a pinch point between the mercury reservoir bulb and the capillary tube, to ensure that the mercury does not shrink back into the bulb after the temperature has been taken. The mercury has therefore to be shaken back into the bulb before another measurement can be made. One should note that in many countries use of mercury based clinical thermometers is now discouraged (because mercury is toxic) and electronic thermometers are used in stead - these do not need shaking.
What liquid metal is used in thermometers?
Mercury (Hg) because it is the only metal which is a liquid at room temperature and conducts heat well. It also has a large range (-39 to 357 oC).However, mercury is rarely used in thermometers today, due to its toxicity. If you come across a liquid metal thermometer, it is most probably one containing an alloy of indium, gallium and tin.
What is red substance in thermometer?
The red substance in a thermometer is typically mercury. Mercury is used in thermometers because it expands and contracts uniformly with changes in temperature, making it an effective liquid for measuring temperature accurately.
Why Mercury thermometer is used domestically and alcoholic thermometer in lab?
Mercury thermometers are used domestically because they are reliable, have a wide temperature range, and are easy to read. Alcoholic thermometers are used in labs because they are non-toxic and can measure a wide range of temperatures accurately. Additionally, they have a lower risk of shattering compared to mercury thermometers.
Do refrigerators use minimum maximum thermometers?
They can do. But most domestic fridges either have a thermometer showing the current temperature, or there is no thermometer in the fridge (probably because it has been misplaced and lost).
Why did they change the liquid in the thermometers?
A thermometer (from the Greek θερμός (thermo) meaning "warm" and meter, "to measure") is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor (e.g. the bulb on a mercury thermometer) in which some physical change occurs with temperature, plus some means of converting this physical change into a value (e.g. the scale on a mercury thermometer). Thermometers increasingly use electronic means to provide a digital display or input to a computer.
Why cant laboratory thermometers be used to measure body temperatures?
Assuming the lab thermometer covers that particular temperature range (about 35-45 degrees Celsius) then it certainly COULD be used to measure body temperature.It's not necessarily ideal for doing so, because lab thermometers are designed differently. Medical thermometers have a "wide spot" in the channel that prevents the working fluid (traditionally mercury) from retracting back into the bulb when the temperature goes down, and lab thermometers do not. This means that a medical thermometer gets "stuck" at its highest temperature reading until the thermometer is "reset" by shaking it. Lab thermometers do not do this, so the temperature must be read while the thermometer is still in contact with the item that you want to measure the temperature of. This may be awkward or difficult, if you're trying to measure someone's internal temperature.
Why are the thermometers called liquid in glass thermometers?
A so-called "glass" thermometer has a small bore-hole in the center of the glass that has some liquid in it. It's the activity of the liquid in the narrow hole that makes the thermometer a thermometer.
Are electronic thermometers more reliable than a standard thermometer?
Electronic thermometers and standard thermometers are equally accurate. In terms of reliability, the standard thermometer wins. Why? Because it doesn't have any batteries to go dead.
Why is mercury used in clinical thermometer and not laboratory thermometer?
Mercury is no longer used much in thermometers due to the poisonous compounds that it forms. When I grew up, in Chemistry at school and at the doctors there were mercury thermometers and alcohol thermometers.
How do tools such as a thermometer rely on thermal expansion?
Thermometers rely on thermal expansion because the liquid inside the thermometer (such as mercury or alcohol) expands and contracts with changes in temperature. As the temperature increases, the liquid in the thermometer expands, causing it to rise in the tube. Similarly, as the temperature decreases, the liquid contracts, causing it to fall in the tube. By measuring this expansion or contraction, the thermometer can accurately gauge the temperature.
Why their is klink absent in laboratory thermometer?
Klink is absent in laboratory thermometers because they are designed for precise measurement of temperature over a wide range, and do not require the klink mechanism found in household thermometers. Laboratory thermometers often use other types of temperature sensing elements, such as mercury or digital sensors, to provide accurate temperature readings.
Is a clinical thermometer a type of analog thermometer?
Yes, a clinical thermometer is a type of analog thermometer. Analog thermometers use a liquid-filled bulb to measure temperature and display the reading on a scale marked with numbers. Clinical thermometers are typically designed for measuring human body temperature and often come with a narrow range of temperatures suitable for this purpose.
Why do you use rubbing alcohol in thermometer?
Rubbing alcohol is used in thermometers because it has a lower freezing point than water, allowing the thermometer to measure lower temperatures accurately. Additionally, alcohol has a wider temperature range than mercury, making it suitable for various types of thermometers.
