The important property of a liquid in a thermometer is thermal expansion. That is, the liquid expands at a consistent and predictable rate so as it expands up the thermometer, it accurately represents the temperature.In this regard, why is liquid used in thermometers?
The liquid used in thermometers has moderate coefficient of expansion so as to measure body temperature where as solids have very low and gases have very high coefficient? of expansion. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion.
Also Know, what is the thermometric substance of liquid in glass thermometer? mercury
Keeping this in view, what are the physical properties of a thermometer?
Thermometric properties commonly used for thermometers include:
- Volume: Most objects expand when they are heated. The volume of mercury or alcohol expands when the temperature increases.
- Electrical resistance:The resistance of a copper wire increases with temperature.
Is mercury a liquid?
Mercury is the only metal that is a liquid at normal temperatures and pressure. Because of the behavior of the valence electrons, mercury has a low melting point, is a poor electrical and thermal conductor, and doesn't form diatomic mercury molecules in the gas phase.
What is liquid in thermometer?
You can identify the liquid in a thermometer based on its color. Silver liquid indicates that the thermometer contains mercury, while red liquid is alcohol to which red coloring has been added. Although uncommon in modern thermometers, a clear color indicates water.Is the red liquid in thermometers dangerous?
That stuff is alcohol, with red dye. Nope it is not Red Mercuric oxide, so if you drink the stuff, I think your danger will be from the broken glasses, which is very, very, sharp. The things to do nowadays, is a electronic thermometer for general use. That stuff is alcohol, with red dye.Can you touch mercury?
It's never safe to touch mercury. In its liquid metal form, mercury absorbs instantly into the skin; but it also has an extremely high vapor pressure, so an open container of mercury disperses the metal into the air.Why is water not used in thermometers?
Water is not helpful to measure below 0oC and above 100oC. The most metals are solids at room temperature but the mercury is liquid form because it has high coefficient of expansion. The mercury does not stick to capillary wall of thermometer and which can easily measure temperature accurately.How do you measure the temperature of a liquid?
One of the most common devices for measuring temperature is the glass thermometer. This consists of a glass tube filled with mercury or some other liquid, which acts as the working fluid. Temperature increase causes the fluid to expand, so the temperature can be determined by measuring the volume of the fluid.Is liquid mercury dangerous?
Although mercury is poisonous (toxic), it usually only causes problems if you inhale large amounts of it. Very little mercury is absorbed by your body if you swallow a small amount of liquid mercury or get it on your skin for a short time. This is considered almost non-toxic and you'll probably have no symptoms.What is the blue liquid in thermometer?
2 Answers. As per the Wikipedia page on Spirit Thermometers: The liquid used can be pure ethanol, toluene, kerosene or isoamyl acetate, depending on manufacturer and working temperature range. Since these are transparent, the liquid is made more visible by the addition of a red or blue dye.What is used in clinical thermometer?
A clinical thermometer is a thermometer used to measure human body temperature. Most made in the 20th century are mercury-in-glass thermometers. They are accurate and sensitive, having a narrow place where the mercury level rises very fast. A kink in the tube stops the mercury level from falling on its own.What is linearity of thermometer?
It is a device that is used to maintain fluctuating temperature and make it constant. It is the property in a thermometer defined as the lowest temperature measured to the highest temperature. Linearity. It is the property in a thermometer defined as the same distance between all degree intervals.What is the function of thermometer?
thermometer. A thermometer is a tool that measures temperature — how hot or cold something is. Thermometers are used to see if you have a fever or tell you how cold it is outside. Made up of thermo (heat) and meter (measuring device), the meaning of the word thermometer is pretty straightforward.What is fundamental interval?
Fundamental interval generally refers to the value of the difference in temperature between two fixed points on a temperature scale, in order to define the scale. It can also be defined as the difference between the values recorded in a thermometer at two fixed points.What is the limitation of clinical thermometer?
what are d limitations of clinical thermometer? Their main disadvantage is that they are fairly easy to break and if they do, it results in small splinters of glass and the release of mercury which is quite toxic if absorbed into the body.What do you mean by absolute zero?
Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. By international agreement, absolute zero is defined as precisely; 0 K on the Kelvin scale, which is a thermodynamic (absolute) temperature scale; and –273.15 degrees Celsius on the Celsius scale.What is specific heat capacity of a substance?
The specific heat capacity of a substance is the amount of heat required to raise one gram of the substance by one degree Celsius. Water, for example, has a specific heat capacity of 4.18 . This means to heat one gram of water by one degree Celsius, it would require 4.18 joules of energy.How do you use a liquid thermometer?
Place the end of the thermometer with the reservoir of liquid in the testing medium. For example, if you are testing the temperature of ice water, place the reservoir in the water, below the ice, but not touching the bottom of the flask or cup the water is held in. This will garner a more accurate temperature.How does a liquid thermometer work?
A thermometer has a glass tube sealed at both ends and is partly filled with a liquid like mercury or alcohol. As the temperature around the thermometer's bulb heats up, the liquid rises in the glass tube. When it is hot, the liquid inside the thermometer will expand and rise in the tube.When did thermometers stop using mercury?
Since 2001, 20 states have banned mercury “fever thermometers” for medical use, and regulations tighten every year. Many pharmacies now carry only sterile digital replacements or the less accurate ones with red glop in the bulb. 
