Physics

Why does the liquid level rise in a thermometer when the temperature is higher?

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2016-11-15 01:28:21
2016-11-15 01:28:21

The liquid expands when it gets warmer.

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A thermometer is a device that is used to gauge temperature. Mercury style thermometers used the elemental liquid in a tube of measured diameter and height. The higher the temperature, the higher the observed mercury level is. Thus, the height of the mercury uses marking to indicate which air temperature corresponds to the given height of its liquid expansion.


That type of thermometer has mercury in it, which is very heat sensitive. When used for taking a temperature, the heat from the body causes the mercury to rise. The amount the level of the mercury rises is determined by the body's temperature; the higher the temp, the higher the mercury rises.


The temperature in a Mercury-based thermometer is read by the level of Mercury found in the thermometer. As Mercury heats up, it expands, therefore raising the level of the Mercury of which we see as a higher temperature. On the other end, as the temperature falls, the Mercury contracts and reads at a lower temperature.


The liquid in the thermometer must steady its temperature first before measuring the temperature of the warm water as the warm water is hotter.


-- Bring thermometer into room. -- Wave it around in the air of the room for a minute or two. -- Do not hold the thermometer in your hand or breathe on it. -- Wait a while for the room temperature to get through the thermometer glass. -- Look through the glass at the sliver of liquid inside the thermometer. Find the end of the liquid, and see what number is marked on the glass at the same level. That number is your room temperature.


Place the thermometer in the liquid you are measuring. Wait until the temperature stabilizes, and then read the thermometer at eye level, just like you would a graduated cylinder, except that there's no meniscus. If you are measuring a liquid that is being heated over a Bunsen burner, you should have the thermometer held in place with a thermometer clamp. You should have the thermometer positioned about halfway down in the liquid.


The liquid in the thermometer's bulb gets heated and, as it does, it expands into the stem.


the temparature of the liquid must be read while the thermometer is in the liquid.since the level of mercury drops as soon as the thermometer is taken out of the liquid ,therefore no need of the kink in thermometer.



It doesn't 'move' exactly, it expands. Originally mercury (a metal in a liquid state at room temperature) was used in thermometers; as the the temperature increases the mercury (or other liquid) expands, taking up more of the volume within the thermometer, causing the level to rise. Thermometers are calibrated to allow the temperature to be measured based on how much expansion has taken place.


Gases expand or contract when heated or cooled. The main part of the thermometer has a 'large' bulb containing a gas connected by a hose to a tube filled with liquid. The expansion or contraction of the gas causes the liquid level to move this indicates the temperature.


The liquid inside the thermometer "contracts" when it is placed into something cold. This means that it decreases in volume and increases in density. This is the reason that the thermometer can measure heat: the volume of the liquid inside the thermometer changes as a function of heat, and the amount of liquid in the "tube" of the thermometer changes as a function of volume. Because of this relationship, the level of the liquid in the tube of the thermometer changes as a function of heat.


The thermometer is a sealed glass tube containing mercury in a vacuum. The mercury column will rise or fall due to expansion, and the level is read off a temperature scale.


In case of ordinary thermometer if the thermometer is taken out the body whose temperature has been seen, the mercury would fall down as the bulb gets cooled. But in case of clinical thermometer even after the thermometer has been taken out of the mouth of the patient the level of mercury would be held at the same level though the bulb falls to the room temperature. So doctor could see the temperature liesurely. To bring back the mercury to lowest level we have to give jerks to the thermometer by shaking it.


The boiling point of water is greater at sea level than at higher elevations, because the air pressure is higher at sea level. The higher the pressure of the surrounding atmosphere, the higher is the boiling point of any liquid, because higher pressure promotes the rate of condensation of the vapor form of the liquid. The boiling point is the temperature at which the rate of condensation exactly equals the rate of vaporization of the liquid.


what happen to the liqiud inside the themomter it expands when placed in warm or hot water and the liquid rises. it contracts when placed in cold water and the liquid decreases.


At the molecular level, temperature is inversely proportional to solubility. As the temperature of a liquid increases, the solubility of gases in that liquid decreases.


Heat is transferred thru the glass of the thermometer to or from the liquid (mercury) inside. The heat causes the liquid to either expand (hot) or contract. Since the large bulb end contains most of the liquid, but grass doesn't expand as much as the liquid, the expanding liquid forces itself up (if hot) into the narrow tube, which indicated the temperature. On the molecular level, particles outside the thermometer have a certain kinetic energy (KR) and the particles inside the thermometer also have a certain KE probably a different amount or they are already at the same temperature. Particles (either molecules or atoms) when in either the solid or liquid state, are constantly in motion (for solids, they just vibrate about a fixed, central position. Collision of the particles outside the thermometer and the thermometer itself cause exchange of some KE until the average KE of the outside particles is equal to the average KE of those in the thermometer. When this occurrs they are at the same temp. This change in KE of the particles in the thermometer causes more motion, and this extra motion causes what we call expansion. All molecules in the thermometer are pushing against each other with more force (KE).



The boiling temperature of a liquid is the temperature at which the pressure of the vapor of a certain liquid and the atmospheric pressure are equal. The boiling temperature of water at sea level is 100 degrees Celsius.


The higher the temperature, the higher the pH level (less acidic). The lower the temperature, the lower the pH (more acidic).


After the thermometer has come into thermal equilibrium with the object being measured, the top level of the liquid (mercury or alcohol thermometer) is the temperature. The indicators will often also be colored red on mechanical (coil expansion) thermometers. Digital thermometers should be "locked" at the recorded temperature if the probe is to be removed before viewing, as it may heat or cool even during a very short interval.


At the age of 31, Galileo and his associates invented the thermometer because no instrument existed to measure temperature. Galileo's thermometer consisted of water in a glass bulb. The level of the water in the bulb changed according to the external temperature.



the mercury should be at normal body temperature level before using it the thermometer should be cleaned after use with normal water the bulb of the thermometer should not be touched



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