When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. ... When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together . This results in movement down the thermometer.
What happens to the red liquid in a thermometer?
Mercury is a silver-white to gray substance. If your thermometer is filled with a red liquid, your thermometer contains red dyed alcohol or mineral spirits and not mercury. These are safer alternatives to mercury fever thermometers.
When a thermometer is heated the red liquid inside the thermometer moves up because?
Why does the red liquid move up the tube when a thermometer is heated? When heated, the molecules in the liquid inside the thermometer get a little further apart. Because the liquid takes up more space , the red line moves up in the tube.
What causes the liquid to fall in a thermometer when you put it in a cold drink?
All liquids expand when heated and contract when cooled (with the exception of H2O near its freezing point; ice-cold H2O at 0 °C contracts until 4 °C where it expands like other materials), which explains why the liquid within a thermometer rises as the temperature increases and falls when it decreases.
What liquid is inside thermometer?
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.
How accurate are alcohol thermometers?
Alcohol thermometers are also inexpensive and durable. They are typically not as accurate as mercury thermometers because of the alcohol's susceptibility to evaporation, polymerization potential and capillary separation. Their primary advantage is safety to humans and the environment.
What causes the liquid in a thermometer to rise?
A glass thermometer has a colored liquid inside it. The level of colored liquid rises when the thermometer is placed in hot water . ... Heat causes the molecules of the liquid to get farther apart. The molecules of the liquid break down into atoms and take up more space.
What does a gas turn into when it gets cold?
If a gas is cooled, its particles will eventually stop moving about so fast and form a liquid . This is called condensation and occurs at the same temperature as boiling. Hence, the boiling point and condensation point of a substance are the same temperature.
Why does the food coloring spread out faster in hot water than in cold water?
Molecules in a liquid have enough energy to move around and pass each other. ... The food coloring you add to the water is pushed around by the water molecules. Since the molecules in warm water move around faster , the food coloring spreads out quicker in the warm water than in the cold water.
Why is the mercury in a thermometer stored in a narrow tube?
3. The tube in the thermometer that contains the red liquid is very thin so that it is easier to see the liquid move up and down. ... The alcohol and the mercury thermometers go up by different amounts because the molecules that make up alcohol and the atoms that make up mercury are different.
How does a thermometer work accurately?
A thermometer measures temperature through a glass tube sealed with mercury that expands or contracts as the temperature rises or falls. ... As temperatures rise, the mercury-filled bulb expands into the capillary tube. Its rate of expansion is calibrated on the glass scale.
What happens inside a thermometer when the temperature goes up Brainpop?
What happens inside a thermometer when the temperature goes up? The heat causes the liquid to expand . The heat boils the liquid into a gas.
How do I know if my thermometer is broken?
- Fill a pot with water, and place the thermometer in the pot. ...
- When the boiling is constant and rolling, make sure it's reading 212°F or 100°C (at sea level).
- Set a timer for five minutes, then check the thermometer again.
How do I know if my mercury thermometer is broken?
If there is a paper calibration strip inside of the thermometer that includes the words “mercury free,” then the liquid in the thermometer is not mercury. If you do NOT see the words “mercury free,” then assume that the liquid is mercury.
Which liquid metal is used in thermometer?
Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.
What is the disadvantage of alcohol thermometer?
| advantages disadvantages | Alcohol thermometer (compared to a mercury thermometer) | lower freezing point (-114 C) less durable (alcohol evaporates) | larger coefficient of expansion alcohol can polymerise | less hazardous fluid loss by evaporation hard to avoid |
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