Alcohol should evaporate, but I would cut out the red part from your food anyway. Choose the suitable range of thermometer to measure the body temperature of the patient. 247 0 obj <>stream How To use a mercury thermometer? Older thermometers of this type used liquid mercury. These liquid thermometers are based on the principal of thermal expansion. �OB�4�\�RJ�Ւ�s7������{^@ ��|�!���i� I���B�P��]�(ڞt%5\44�b�����U�R��Gå�FCc�0��{邳�~ =p�خ�N�V�,�t �8dW�| ��`��/l4xǎ����.���y�F����%�xu���h. Different Parts of a Mercury Thermometer. One study found a mean difference of 0.468C between core temperature and measurements taken using a disposable thermometer in the axilla (Fulbrook, 199… ____________________________________________________________________. The accuracy is stated as ±1 division. Diagram 8.3 shows the length of mercury column, l = 15 cm when the thermometer is placed in a hot liquid with … The main reason they are not longer recommended is that mercury can poison you. Depending on the thermometer … However, at the axilla the average difference was only 0.018C, not significantly different to the core temperature. The Miljoco SX935 series with a range of 30°F to 240°F has a 2 degree division so the accuracy is 2°F. ,�����D�!�s���{�j��qH�h$v,�S ���[�"}`�B ���&`�)�]��8J����8/ �Nl [1m], Diagram 9.1 and Diagram 9.2 show the reading of the thermometers when an amount of water is heated for 5. minutes. endstream endobj 149 0 obj <> endobj 150 0 obj <>/Font<>/ProcSet[/PDF/Text]/XObject<>>>/Rotate 0/TrimBox[0 0 595 842]/Type/Page>> endobj 151 0 obj <>stream Mercury thermometers can be used to determine body, liquid, and vapor temperature. Both immersion heaters have the same specification. Diagram 8.2 shows the length of mercury column, l = 25 cm when the ice cubes and water in the beaker are boiled until 100 °C. This thermometer is a thin glass tube with a silver tip and line inside. This preview shows page 5 - 8 out of 8 pages. These thermometers have been mercury free for a long long time and instead have a non-toxic liquid spirit that moved up and down in the tube as the temperature changes. Where ΔT= Δl/lοα and α is the linear expansion coefficient. %PDF-1.5 %���� h�bbd```b``��� ��Dr�H�Z�̶���@$�#�"y��^`f�HF0)� �+ ��:�d]Vi�P����LJ��`��)�dr �� Alcohol-filled and galinstan glass thermometers are harder to find in regular grocery stores. In response to our understanding of the health concerns associated with mercury exposure, these types of thermometers usually use some type of liquid alcohol. In the year 1714, the physicist and engineer Gabriel Fahrenheit Created the first thermometer that used mercury instead of water, as it expanded and contracted more quickly. They quit putting mercury in thermometers (especially cooking ones) a long time ago because mercury is highly toxic. Diagram of apparatus : Diagram of apparatus : Description Immerse the bulb of the thermometer into a funnel containing pure melting ice at one atmospheric pressure. Galinstan thermometers have a silver-colored line, but will be marked "mercury-free" when you buy one. Regarding mercury-filled devices, clinical thermometers have kinks to prevent the instant back flow of mercury. The red liquid is probably alcohol (or mineral oil) & dye. The Fahenheit scale is named for German physicist Daniel Fahrenheit (1686–1736), who made the first mercury thermometer in the early 18th century. Diagram 81 shows an uncalibrated mercury thermometer placed in a beaker, Diagram 8.1 shows an uncalibrated mercury thermometer placed in a beaker containing ice cubes. Research in this area is scarce. 199 0 obj <>/Filter/FlateDecode/ID[<863CF2A26BB7B13DD0ED4BFC0D6933C5><01DFF25B848D58459C305D2644CE6EA0>]/Index[148 100]/Info 147 0 R/Length 173/Prev 162052/Root 149 0 R/Size 248/Type/XRef/W[1 3 1]>>stream Relate the reading of thermometer with volume of water to make a deduction regarding the. 15 The diagram shows a clinical thermometer. Diagram 8.1 shows an uncalibrated mercury thermometer placed in a beaker containing ice cubes and water at 0 °C. It works on the principle: ΔL α ΔT. Since mercury is highly toxic, using them in food or in the body is discouraged. Explain how the land breeze phenomenon occurs during the night time. 148 0 obj <> endobj However, gas thermometers are more expensive than liquid-in-metal thermometers due to their more complex design. %%EOF This is the ice point. Well, as it turns out, the type of thermometer you choose does indeed have a significant impact on your temperature reading as well as your all-around safety, so let’s take a look at the following digital thermometer and mercury thermometer comparison to check out a few reasons why. When the mercury reaches the compartment, it means that the thermometer can not expand further and reach higher degrees of temperature. The mercury thermometers were difficult to read and so did not always provide accurate information. h�b```b``Ve`c``Y� Ȁ �,@Q�= ��5�1�1�᐀厀/l l������b�6C[�rc������ʌ��ii�r[o�l� &���ױO �O��ז=�):�:m{�@���ڝ�e���[�T]�)*>����i``��h�`0b� ���"p �:�:j �{��0g`�� ��l��B��L�9�Um���I�ή'��q-��d bs�l��|��#��i�P�Z�)ڎ*\�i}XݲF�&�ϦuB]_���V��I��/�f�)�V�W�]�� E�#S� ���GpQ'��eQ� ve`*���� ���� In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. See Page 1. Mercury thermometers provide accurate, repeatable temperature readings from -40 degrees Celsius (which is also -40 degrees Fahrenheit) to 650 degrees Celsius (1202 degrees Fahrenheit). It has linear expansion property and has a temperature range of -35°C to +500 °C(with compressed nitrogen). Using Diagram 9.1 and Diagram 9.2, compare the readings of both thermometers, the volume of water. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Diagram 8.3 shows the length of mercury column, = 15 cm when the thermometer is placed in, Complete the following sentence by ticking (, Based on Diagram 8.1 and Diagram 8.2, determine the difference in length of mercury, ___________________________________________________________________________, Based on Diagram 8.3 and answer in 8(b)(i), calculate the temperature, What will happen to the boiling point of the water if it is boiled on the peak of Gunung, Diagram 8.4 shows design of a thermometer which can be used to determine the body, Table 8.1 shows several characteristics of different thermometers. 3 Page 1 of 6 SECTION 1: Identification of the substance/mixture and of the Manufacturer Chemical Name: Mercury, Hg (CAS No: 7439-97-6) Manufacturer Product Name: Mercury In Glass Thermometer Recommended uses of the chemical/product: Mercury is the … Mercury is sliver, not red. Due to its simplicity, almost anybody can be taught to use a clinical thermometer. Based on the answers in 8(c)(i), 8(c)(iii) and 8(c)(v), choose the most suitable, thermometer which can be used to determine the body temperature of the patient. It works on the principle: ΔL α ΔT. Mercury thermometers; mercury thermometer. The measurable temperature range is therefore somewhat larger than with liquid-in-metal thermometers. Consider discontinuing the use of thermometers containing mercury if it is used for cooking or is a clinical thermometer. Course Hero is not sponsored or endorsed by any college or university. The simplest thermometers really are … In the past, mercury (MER-kure-e) thermometers were used. You are required to modify the car radiator system so that it can cool the engine effectively. The red liquid is probably alcohol (or mineral oil) & dye. Depending on the thermometric gas, temperatures down to -200 °C or up to over +700 °C can be measured with a gas thermometer. in the polystyrene cup and the time of heating the water. The range is affected by the metal with which mercury is amalgamated. relationship between the increase in temperature and the mass of water in the polystyrene cup. Digital Thermometer vs. Mercury Thermometer How To use a mercury thermometer? Alcohol should evaporate, but I would cut out the red part from your food anyway. The scale includes the marks on the body of the thermometer and indicates the temperature level. State and. Mercury is sliver, not red. On the other hand, laboratory thermometers do not usually need to actively stop such back flow. In addition, the mercury expansion is more predictable so it can be measured more easily, at the same time published its scale that today is called the Fahrenheit scale to measure temperature. 0 This can happen when the glass breaks and mercury is released. Mercury In Glass Thermometer Safety Data Sheet Effective date: April 1, 2016 According to 29 CFR 1910:1200 and GHS Rev. The length of mercury column, l = 5 cm. 6) Users. Diagram 8.2 shows the length of mercury column, = 25 cm when the ice cubes and water in the beaker are. When the mercury level in the thermometer stem is steady, make a mark l 0 at that level on the stem. They quit putting mercury in thermometers (especially cooking ones) a long time ago because mercury is highly toxic. Mercury thermometers; mercury thermometer. explain the modifications based on the following aspects. i endstream endobj startxref Choose the suitable diameter of capillary tube for the thermometer.