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Why are the steam and ice points of water better fixed points for a thermometer than the temperature of a human body?
Wiki User
∙ 8y ago
The boiling point and freezing point of water have less variations. Note that you do need to specify a pressure - especially the boiling point can vary quite a lot for different pressures.For a very large accuracy, you would also want to specify the isotope mix for the water.
Wiki User
∙ 8y ago
Wiki User
∙ 8y agoThe human body temperature is not the same for all people.
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What are the fixed references points on the celsius thermometer?
0 to 100 i think
Does evaporation occur without a fixed temperature?
=well it has to be hot for evaporation to occur but no it doesn't have a fixed temperature!=
Why the tube leading up from the bulb in a thermometer is very thin?
because its contain a silver mercury exactky fixed to it
How Will You Calibrate a thermometer in degree Celsius.. ..?
The thermometer was used by the originators of the Fahrenheit and Celsius scales.Anders Celsius, a Swedish Astronomer, devised the Celsius scale, which was described in his publication the origin of the Celsius temperature scale in 1742.Celsius used two fixed points in his scale: the temperature of melting ice and the temperature of boiling water. This wasn't a new idea, sinceIsaac Newton was already working on something similar. The distinction of Celsius was to use the melting temperature and not the freezing temperature. The experiments for reaching a good calibration of his thermometer lasted for 2 winters. By performing the same experiment over and over again, he discovered that ice always melted at the same calibration mark on the thermometer. He found a similar fixed point in the calibration of boiling water vapour (when this is done to high precision, a variation will be seen with atmospheric pressure). At the moment that he removed the thermometer from the vapour, the mercury level climbed slightly. This was related to the rapid cooling (and contraction) of the glass.The air pressure influences the boiling point of water. Celsius claimed that the level of the mercury in boiling water is proportional to the height of the barometer.When Celsius decided to use his own temperature scale, he originally defined his scale "upside-down", i.e. he chose to set the boiling point of pure water at 0 °C (212 °F) and the freezing point at 100 °C (32 °F).[1] One year later Frenchman Jean Pierre Cristin proposed to invert the scale with the freezing point at 0 °C (32 °F) and the boiling point at 100 °C (212 °F). He named it Centigrade.[2]Finally, Celsius proposed a method of calibrating a thermometer:Place the cylinder of the thermometer in melting pure water and mark the point where the fluid in the thermometer stabilises. This point is the freeze/thaw point of water.In the same manner mark the point where the fluid stabilises when the thermometer is placed in boiling water vapour.Divide the length between the two marks into 100 equal pieces.These points are adequate for approximate calibration but both vary with atmospheric pressure. Nowadays, the triple point of water is used instead (the triple point occurs at 273.16 kelvins (K), 0.01 °C).
What are the equal divisions between the two fixed points?
midpointbisection
What determines the upper and lower fixed points of a thermometer?
Upper fixed point is the temperature of pure water boiling at normal atmospheric pressure.Lower fixed point is the temperature of a mixture of pure ice and pure water at normal atmospheric pressure. Each thermometer has a scale containing an upper and lower fixed points depending on the use of this thermometer for specific measurements.
What are the fixed references points on the celsius thermometer?
0 to 100 i think
Why fixed points are needed before a temperature scale is marked on a thermometer?
Generally two fixes points,Tof pure melting ice and T of steam of water boiling at one atomospheric pressure.are needed to build a standard degree of coldness and hotness. So that there will be a range of T to set the scale.
Who built a thermometer based not one but two fixed points?
The Celsius scale is based on two fixed points: The freezing point of water at 0 degrees, and the boiling point of water at 100 degrees.
What are the fixed reference points on the celsius thermometer?
If you have 2 then you are right. The freezing point of water and the boiling point of water are the 2 fixed points.
What does water have to do with measuring temperature?
The fixed points on the Celsius scale, for measuring temperature are based on the freezing and boiling points of water and, to that extent water is relevant to the measurement of temperature.
Name two convenient fixed points for checking the calibration of the temperature in the temperature range 250 kelvin to 400 kelvin?
Freezing and boiling points of water.
What is the boiling point on the thermometer?
Internationally agreed temperature scales are based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 K (−272.5 °C; −458.5 °F) to approxim Internationally agreed temperature scales are based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 K (−272.5 °C; −458.5 °F) to approximately 1,358 K (1,085 °C; 1,985 °F). ately 1,358 K (1,085 °C; 1,985 °F).
List of themometers?
The thermometer is a device that measures temperature or temperature gradient using a variety of different principles; it comes from the Greek roots thermo, heat, and meter, to measure. A thermometer has two important elements: the temperature sensor (e.g. the bulb on a mercury thermometer) in which some physical change occurs with temperature, plus some means of converting this physical change into a value (e.g. the scale on a mercury thermometer). Industrial thermometers commonly use electronic means to provide a digital display or input to a computer. Thermometers can be divided into two groups according to the level of knowledge about the physical basis of the underlying thermodynamic laws and quantities. For primary thermometersthe measured property of matter is known so well that temperature can be calculated without any unknown quantities. Examples of these are thermometers based on the equation of state of a gas, on the velocity of sound in a gas, on the thermal noise (see Johnson-Nyquist noise) voltage or current of an electrical resistor, and on the angular anisotropy of gamma ray emission of certain radioactive nuclei in a magnetic field. Secondary thermometers are most widely used because of their convenience. Also, they are often much more sensitive than primary ones. For secondary thermometers knowledge of the measured property is not sufficient to allow direct calculation of temperature. They have to be calibrated against a primary thermometer at least at one temperature or at a number of fixed temperatures. Such fixed points, for example, triple points and superconducting transitions, occur reproducibly at the same temperature. Internationally agreed temperature scales are based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 K to approximately 1358 K (−272.5 °C to 1085 °C). qewbuor'/
How you find fixed points of a function?
The fixed points of a function f(x) are the points where f(x)= x.
What is the temperature taken as lower fixed point in Celsius scale?
The two main fixed points in the Celsius scale are: Zero degrees the freezing point of water and 100 degrees its boiling point. Any temperature below freezing are minus values, the lowest being -273 degrees absolute zero the point where everything stops.
Do liquids have fixed temperature but no fixed shape?
Yes
