How A Liquid Thermometer Measures Temperature?
A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls. The tiny size of the bulb and micro-fine size of the tube help the mercury reach the temperature of what it is measuring very rapidly.
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.
How is liquid temperature measured?
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.
How liquid in a thermometer changes so that it can be used to measure a temperature?
actually it is dependent on thermometer type the glass tube of the thermometer is filled with either alcohol or Mercury and when it gets hotter the liquid get heated and expands and rise up taking up more space inside the tube. … This rise and fall of the liquid indicates the temperature.
How does a liquid thermometer show that you have a fever?
In a mercury thermometer a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature the mercury expands and contracts and the temperature can be read from the scale. Mercury thermometers can be used to determine body liquid and vapor temperature.
Why does the liquid in the thermometer rise?
The liquid in the thermometer goes up when the thermometer is heated because heating makes the alcohol molecules of the liquid move faster. The extra speed of the molecules competes with their attraction for one another and causes them to move slightly further apart.
Why are liquids used in a thermometer?
It is because the liquids like mercury and alcohol expand uniformly on increasing temperature and also contracts uniformly on decreasing the temperature. So it gives us the accurate measure of the temperature. That’s why liquids are used in the thermometer not solids or gases.
What are liquid thermometers?
Thermometer liquids are mercury and alcohol.
What are the 3 ways to measure temperature?
There are three main scales commonly used in the world today to measure temperature: the Fahrenheit (°F) scale the Celsius (°C) scale and the Kelvin (K) scale.
Why liquids are not used for measuring very high temperature?
Explanation: because mercury thermometer is used for measuring high temperature as its boiling point is 356℃ so there will be no change in volume and other physical properties .
Why does the liquid in the thermometer expand and contract when temperature changes?
When a liquid is hot the molecules move around faster and bump into each other and the walls of the container more often and harder than slower moving molecules do. One result of this is that a hot liquid will expand in direct proportion to its temperature.
Which liquid is used in liquid in glass thermometer?
It consists of mercury as a liquid filled in a glass tube. On the body of the glass tube calibrated marks are provided which facilitates the reading of temperature. A bulb is formed at one end of the thermometer which contains the largest part of mercury.
Which Celsius reads the warmest temperature?
45 degrees Celsius is hotter than 37 degrees and four degrees. The thermometer that shows the coldest temperature is A. And the thermometer which shows the hottest temperature is C.
Can you use a thermometer to measure water temperature?
Instant-read thermometers are a type of all-purpose food thermometer that are inserted in food for a few seconds until they get an accurate reading. … However you should never ever use a digital thermometer used to take body temperature to measure water.
Does a thermometer measure heat or temperature?
What does 37 mean in thermometer?
The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the “normal” body temperature can have a wide range from 97°F (36.1°C) to 99°F (37.2°C). A temperature over 100.4°F (38°C) most often means you have a fever caused by an infection or illness.
Does liquid in the thermometer rise when put in hot water?
The hot water heats the liquid causing it to expand and therefore liquid in the thermometer rises. … Within the tube is a thermometric liquid majorly the mercury that expands proportionally to temperature and so measures it.
What do F and C means in thermometer?
There are two scales used for taking temperature: Fahrenheit (F) and Centigrade (C).
Why do thermometers use liquid instead of a solid or gas?
Liquids are used in thermometers because they expand and contract with temperature changes and they take on the shape of a container without filling it. Solids do not work in thermometers because they do not take on the shape of the container.
Can you touch mercury?
Mercury is a very toxic or poisonous substance that people can be exposed to in several ways. If it is swallowed like from a broken thermometer it mostly passes through your body and very little is absorbed. If you touch it a small amount may pass through your skin but not usually enough to harm you.
What are the properties of liquids that will make them suitable for use in liquid thermometer?
The liquids should also have a sufficiently high boiling point so that they do not vaporize at high temperatures. Furthermore the liquid must expand evenly with the temperature in the measuring range used. Otherwise an uneven division of the scale on the thermometer would be necessary.
What is the temperature range of liquid filled thermometer?
Liquid-filled thermometers provide a direct reading of the temperature. Liquid-filled thermometers are commonly used in technology and in the laboratory for measuring temperatures from –200° to 750°C. They consist of a transparent glass (rarely quartz) bulb fused to a stem of the same material.
What are the 2 liquids used in thermometers?
The two common liquids used in liquid-in-glass thermometers are alcohol (ethanol) and mercury which have melting points and boiling points of -114 C 79 C and -39 C 357 C respectively.
What type of thermometer is best for liquids?
Frothing thermometers are designed to give readings on hot milk or other beverages making them the best thermometer for liquids in most cases. They feature a clip that fastens to a frothing pitcher and an extra-long probe for reaching inside.
How do we measure temperature?
- Under the armpit (axillary method)
- In the mouth (oral method)
- In the ear (tympanic method)
- In the rectum/bum (rectal method)
What are the 4 types of temperature?
- Fahrenheit Scale. ••• The Fahrenheit scale of temperature is the common form of temperature measurement used in the United States and some parts of the Caribbean. …
- Celsius Scale. ••• …
- Kelvin Scale. ••• …
- Rankine Scale. •••
What are four methods of measuring temperature?
The seven basic types of temperature measurement sensors or temperature checking devices discussed here are thermocouples resistive temperature devices (RTDs thermistors) infrared radiators bimetallic devices liquid expansion devices molecular change-of-state and silicon diodes.
Why is alcohol used in thermometers instead of water?
Alcohol thermometers are used rather than mercury thermometers in very cold regions because alcohol has a lower freezing point than mercury. … If it freezes it won’t move in the tube so a liquid must be used that has a freezing point that’s lower than the temperature it’s measuring.
Why mercury is used in thermometer not water?
How do you make a water thermometer?
- Put a few drops of food coloring into the water bottle and fill it to the top with lukewarm water.
- Insert the straw a couple inches into the bottle and mold the clay around it to seal the bottle and hold it in place. …
- Use a marker to mark the level of the water in the straw.
How does temperature affect water molecules?
Which liquid expands the most?
liquid oxygen 1 to 860. Neon has the highest expansion ratio with 1 to 1445.
What is expansion in liquid?
How accurate are liquid thermometers?
Organic-Liquid-Filled Glass Thermometers contain nonhazardous liquid in a graduated scale tube which closely resembles their mercury predecessors. The accuracy of a typical glass thermometer is ±1 scale division.
How Do We Tell Temperature?
Various Types of Thermometers Measuring Temperature How They Are Used Learning For Children
The Liquid in Glass Thermometer – How it Works
Thermometer to measure temperatures | Measurement | Physics