0 ,�����D�!�s���{�j��qH�h$v,�S ���[�"}`�B ���&`�)�]��8J����8/ �Nl Explain how the land breeze phenomenon occurs during the night time. Mercury thermometers; mercury thermometer. endstream endobj startxref [1m], Diagram 9.1 and Diagram 9.2 show the reading of the thermometers when an amount of water is heated for 5. minutes. 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 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. Mercury is sliver, not red. Consider discontinuing the use of thermometers containing mercury if it is used for cooking or is a clinical thermometer. These liquid thermometers are based on the principal of thermal expansion. explain the modifications based on the following aspects. This preview shows page 5 - 8 out of 8 pages. On the other hand, laboratory thermometers do not usually need to actively stop such back flow. Mercury thermometers can be used to determine body, liquid, and vapor temperature. Due to its simplicity, almost anybody can be taught to use a clinical thermometer. 148 0 obj <> endobj Choose the suitable consistency of the thermometer. 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 … Older thermometers of this type used liquid mercury. They quit putting mercury in thermometers (especially cooking ones) a long time ago because mercury is highly toxic. 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. One study that compared a disposable thermometer (3M TempaDot) to core pulmonary artery readings found that oral mean readings were significantly higher than core (0.438C) (Henker and Coyne, 1995). This thermometer is a thin glass tube with a silver tip and line inside. %%EOF Mercury In Glass Thermometer Safety Data Sheet Effective date: April 1, 2016 According to 29 CFR 1910:1200 and GHS Rev. The Celsius scale is named for the Swedish scientist who devised it, Anders Celsius (1701–1744). 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. in the polystyrene cup and the time of heating the water. The mercury thermometers were difficult to read and so did not always provide accurate information. 247 0 obj <>stream Depending on the thermometric gas, temperatures down to -200 °C or up to over +700 °C can be measured with a gas thermometer. You are required to modify the car radiator system so that it can cool the engine effectively. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. h��YmS�H�+����i4R�V�l�KBa��;���*��I�������]6�`���5�[OwO�3�3Br�pGr��QKGH��u��=�!j��G�;��1�ϥu� u�(kw|�j��j���uW�� (���`)|G!�@�!T�� h�bbd```b``��� ��Dr�H�Z�̶���@$�#�"y��^`f�HF0)� �+ ��:�d]Vi�P����LJ��`��)�dr �� Digital Thermometer vs. Mercury Thermometer However, at the axilla the average difference was only 0.018C, not significantly different to the core temperature. 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 A the constriction B the length of the glass tube C the thickness of the glass in the wall of the bulb D the volume of mercury in the thermometer Diagram 8.1 shows an uncalibrated mercury thermometer placed in a beaker containing ice cubes and water at 0 °C. Mercury is sliver, not red. 6) Users. One study found a mean difference of 0.468C between core temperature and measurements taken using a disposable thermometer in the axilla (Fulbrook, 199… �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. relationship between the increase in temperature and the mass of water in the polystyrene cup. Research in this area is scarce. 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. Different Parts of a Mercury Thermometer. In the past, mercury (MER-kure-e) thermometers were used. The Fahenheit scale is named for German physicist Daniel Fahrenheit (1686–1736), who made the first mercury thermometer in the early 18th century. Diagram 8.2 shows the length of mercury column, = 25 cm when the ice cubes and water in the beaker are. The range is affected by the metal with which mercury is amalgamated. 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. Course Hero is not sponsored or endorsed by any college or university. It has linear expansion property and has a temperature range of -35°C to +500 °C(with compressed nitrogen). Galinstan thermometers have a silver-colored line, but will be marked "mercury-free" when you buy one. Since mercury is highly toxic, using them in food or in the body is discouraged. The Miljoco SX935 series with a range of 30°F to 240°F has a 2 degree division so the accuracy is 2°F. Diagram 8.3 shows the length of mercury column, l = 15 cm when the thermometer is placed in a hot liquid with … It works on the principle: ΔL α ΔT. New electronic thermometers and those that use a red dye and alcohol mixture are much easier to read and safer to use. The scale includes the marks on the body of the thermometer and indicates the temperature level. They quit putting mercury in thermometers (especially cooking ones) a long time ago because mercury is highly toxic.

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