The mercury pools in the bulb, but when it heats up, it expands. Because it can't expand through the bottom of the bulb, it is forced up the tube. That expansion, caused by the atoms flying around faster and taking up more space, is what makes the thermometer work.
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Likewise, why does the liquid in a thermometer rise when heated?
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.
Also Know, what are the advantages of using mercury in a thermometer? High thermal conductivity, high sensitivity to temperature, and good visibility make mercury the best for liquid-filled Thermometers. Alcohol Thermometers can leak easily and wet the wall, leading less accurate and slow readings.
In this way, when a thermometer is put in hot water the mercury level rises because the mercury increases in?
However, very quickly, temperature of liquid mercury will catch up (attain equilibrium temperature) with the glass bulb temperature (and that of the hot water), and mercury will start to expand into the capillary, thereby indicating a rise in level in the capillary and a higher temperature.
When a mercury thermometer is placed in hot water?
a. This happens because initially the glass of the thermometer expands while the mercury. So, the mercury will remain at the same volume while the volume of the glass container will expand resulting in what appears to be a drop in the temperature.
Related Question AnswersWhat happens when a thermometer is placed in hot water?
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 is the relationship between temperature and kinetic energy?
Kinetic energy is the energy that an object has because of its motion. The molecules in a substance have a range of kinetic energies because they don't all move at the same speed. As a subtance absorbs heat the particles move faster so the average kinetic energy and therefore the temperature increases.What is inside the thermometer?
Identification. 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.When a mercury in glass thermometer is heated its mercury column goes down briefly before rising Why?
When you apply heat to the bulb very fast, as by a flame, the glass will heat up and expand faster than the mercury will. In that interval, the volume inside the bulb will increase faster than the volume of the mercury will, causing the mercury column to drop briefly before the mercury heats up.Why do we use mercury in thermometers instead of water?
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. It also has a high boiling point which makes it very suitable to measure higher temperatures.When kept in ice mercury in a thermometer will?
If we dip our thermometer in some ice, we can observe where the mercury level comes to and mark the lowest point on our scale, which will be roughly 0°C. Similarly, if we dip the thermometer in boiling water, we can wait for the mercury to rise up and then make a mark equivalent to 100°C.Can a thermometer explode?
What causes a thermometer to explode? For the red colored thermometers, alcohol is usually the working fluid, and it will usually hold up to about 170 or 180 degrees fahrenheit. For the silver colored thermometers, mercury is the working fluid, and the glass can only hold it up to about 120 degrees, or possibly less.How do you reset a mercury thermometer?
Method 2 Warming- Place the thermometer in the sink.
- Gradually heat the bulb with a hair dryer on warm. The mercury will rise to the top of the thermometer and join together.
- Allow the thermometer to gradually cool down to room temperature.
- If you need to take several attempts, just heat and cool gradually.
Can thermometer mercury cause death?
There may be brain damage. Very large exposures will likely cause death. A large overdose of inorganic mercury may cause massive blood and fluid loss, kidney failure, and likely death. Chronic brain damage from organic mercury poisoning is difficult to treat.How do you read a mercury thermometer?
To read a mercury thermometer, hold it between your finger and thumb and turn it until you can see the point on the scale. 1. Hold the thermometer by the top end and shake it down sharply until the mercury falls below the 35C (95F) mark. Sit your child on your lap, facing away from you.When a mercury thermometer is heated?
When mercury thermometer is heated, the mercury expands and rises in the thin tube of glass. What does this indicate about the relative rates of expansion for mercury and glass?How accurate is mercury thermometer?
Mercury thermometer are extremely repeatable and accurate over many years. You could put a working mercury thermometer in a time capsule and bury it for 10,000 years and it would still be working accurately. As long as the glass has not been cracked it will continue to function accurately.How do you calibrate a mercury thermometer?
Method 1: Ice Water- Fill a glass with ice cubes, then top off with cold water.
- Stir the water and let sit for 3 minutes.
- Stir again, then insert your thermometer into the glass, making sure not to touch the sides.
- The temperature should read 32°F (0°C). Record the difference and offset your thermometer as appropriate.
When did they stop putting mercury in thermometers?
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.Do thermometers still use mercury?
The amount of mercury in a thermometer is very small, usually up to 3g. Mercury thermometers are being phased out. You can use several other types of thermometer to take someone's temperature, such as digital thermometers, thermometer strips and ear thermometers.Why the expansion of the glass of the thermometer is ignored?
The pressure of a constant volume of gas increases with temperature. The change in the length of the glass tube with variation in temperature is so small that we can ignore that and concentrate on the expansion of the volume of liquid in the bulb. As this volume expands it forces the liquid up into the glass tube.What are the advantages and disadvantages of mercury thermometer?
A thermometer comparison| advantages | disadvantages |
|---|---|
| mercury vapour is poisonous | |
| Alcohol thermometer (compared to a mercury thermometer) | |
| lower freezing point (-114 C) | less durable (alcohol evaporates) |
| larger coefficient of expansion | alcohol can polymerise |
