Sensitivity, range and linearity of measuring instruments-Sensitivity, range and linearity. <> endobj
<>/Metadata 415 0 R/ViewerPreferences 416 0 R>> 10 0 obj endobj Once the thermometer is removed from the mouth, the mercury in the bulb cools and contracts, breaking off from the mercury thread at the constriction, but the mercury that's beyond the constriction stays in the tube, showing the body temperature is at. x����O�0���?�c��W�矙���bӦV�a��R�Fat;���p($���^R;n�����o/�/6p|<>�����ج�ZmF�I}r��)�.�"|�� @7Y�S���~���,�b���,�ʂ�8ڠ��fl,,o�����z� ��[��QA����b�/��,`v>�e�\�� s�آ�OĹ��F���LD��@"��H[�C�t.
If one junction is at a higher temperature than the other one, an electric current flows, producing a reading on a digital voltmeter, the voltage of the current is directly related to the temperature.They are used in industry to measure a vast range of temperatures from -250℃, they are also very good at measuring the temperatures on small objects or for rapidly changing temperatures.Resistance thermometers are used to measure temperatures accurately from -200They work by using the fact that electrical resistance builds up in a platinum wire when the temperature increases. 6 0 obj <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.25 842] /Contents 12 0 R/Group<>/Tabs/S/StructParents 2>> 12 0 obj <> A glass bulb with thinner wall – Heat can be transferred to the bulb easily. We'll assume you're ok with this, but you can opt-out if you wish.Accept Read More. 2 0 obj They are best used for steady temperatures and are bulky.Constant-Volume Gas thermometers use the change in pressure of a gas to measure temperature. ●Linearity is when a given change in …
endobj 7 0 obj The range of a thermometer, on the other hand, refers to the dissimilarity between the maximum and the minimum temperature. ���˓J�GD�s��� �T�R^�+�7&�KE��ᐊ��!$*���0�I�I�� ?K8��F8J���d'���B�R %PDF-1.7 endobj The sensitivity of a thermometer is defined as the increase in the length of the mercury column per unit increase in temperature. 1 0 obj Capillary with narrow bore – produces a greater change in the length of the mercury column. endobj endobj 5 0 obj
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Acids are all: sour, corrosive and soluble in water All alkalis are the chemical opposite of acids, have a so...There are two muscles in the iris: the circular muscle and the radial muscle, the diagram below shows both of them Courtesy of http://ge...Capillary tube - A glass tube with thick walls and a narrow interior hollow tube (bore). %����
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By flicking your wrist, the mercury returns to the bulb again.Mercury thermometers (for clinical use) are now being replaced by digital thermometers, because mercury is toxic.Thermocouples are used to measure temperatures that change quickly or are very high.Thermocouple thermometers have wires made of two different materials, e.g iron and copper that are joined together. endstream stream Thermochromic Liquids 8 0 obj
Sensitivity is defined as the ratio of the change in output value to change in input signal. 3 0 obj Image source and credit: http://www.advancedaquarist.comTo the left is a labelled diagram of a thermometer, you don't need to know all of the different parts of a thermometer, but I included it to help you understand.When the glass bulb is is heated, the liquid in the bulb starts to expand up the capillary tube. ●Range is the difference between maximum and minimum temperatures. It works over a wide rang of temperatures, and is bulky.Thermochromic liquids change colour when heated or cooled, they have a limited range of temperatures (around room temperatures). GCSE Keywords: Scale, Linear, Precision, Sensitivity ... Thermometers and temperature 16. � ���ݚ�#yS 9 0 obj
Close. <> }�y��|�}�E��vpy߀)%���}dJO>�Ec�R�����Ф���u�6����D���z��G�e�%��w��G�Z�/Iuإ��Q��e8@�S��Q��I�zR]��A��I��^!h���}4�� mR��xO��I��^�}�D¤�z��o�4���C#lp�8N��>v�߆H��ꥱ"v$M�����Uɱ4����E�6���IX7����.&��u�L.#&��+�ˈIQ�2�|�����x3� #r4�ށu�8�ޡ�)� Constant-Volume Gas Thermometers Constant-Volume Gas thermometers use the change in pressure of a gas to measure temperature. endobj When designing bridges, railway...What are acids and alkalis? �$��B It's resistance decreases with temperature. It has a bulb at one end. Thermistors Thermistors work over a small range, ie. x��][��6~`����VěH-��� Z4��f�}X�c{y��Y����e��l�����ls}�����Տ(C4����B�]����9�,��/�n�d�wx���;��:�ٻ�O>L���tVM��36y~�b1Ye��|R�7�)��3�[-28Tm����0�!��}��;�;x�m4�ù"���b���'�������\_�1$Ceg0H!r!��(r$�"����e�ux�j`�.j�����3���Wl�}s}����M�u� �_�_Z��]�b�Ƙ�Ù�Qf0�i���S�&�鬔�. endobj Be able to expand and contract quickly over a wide range of temperaturesCommonly Mercury and Alcohol (coloured) are used because Mercury boils at 357℃, therefore Alcohol is more suited to low temperatures and Mercury is suitable for higher temperatures.Clinical thermometers are used by doctors and nurses to measure patient's body temperatures, they are mercury-in-glass thermometers. <> The sensitivity of a thermometer can be increased by Using a thermometer with a smaller bulb – A smaller bulb contains less mercury and hence absorbs heat in shorter time.
The range of a liquid-in-glass thermometer is limited by the length of the thermometer and can be increased by: increasing the diameter of the capillary – this means that the liquid will not expand as far along the tube per degree rise in temperature. 'G ��|G�l*�-�g�o_:�s��\Dx����� endobj