NOVA AYU RAHMADYA ABSENT NUMBER: 16 CLASS: 7C

ADVANTAGE and DISADVANTAGE Advantage of alcohol thermometer : * It can measure a low temperature, because it freezing point is low. * It can measure the temperature precisely, because it has large expansion coefficient. * It expansion is regular.

Disadvantage of alcohol thermometer : It cannot measure a high temperature, because its boiling point. It makes wet the wall of its place. It is colourless so it must be given dyestuff in order to be visible.

Advantage of mercury thermometer : # It is visible, because its colour is silvery shining. # Its expansion is regular. # It does not make wet the wall of its place # It can measure a high temperature, because its boiling point is high # It can measure the temperature quickly and precisely.

Disadvantage of mercury thermometer: It cannot measure very low temperature, because its freezing point is high. Mercury is poisonous, so it is harmful if its tube is broken. Its price is very high.

the contents of an alcohol thermometer are less toxic and will evaporate away fairly quickly The liquid used can be pure ethanol or toluene or kerosene depending on manufacturer and working temperature range ALCOHOL THERMOMETER

used to measure small differences of temperature, but not absolute temperature values thermometer's length is usually 40 – 50 cm The temperature scale typically covers about 5 o C and it is divided into hundredths of a degree Beckmann thermometer

measure temperature using blackbody radiation (generally infrared) emitted from objects. They are sometimes called laser thermometers The most basic design consists of a lens to focus the infrared energy on to a detector, which converts the energy to an electrical signal INFRARED THERMOMETER

made of a sealed glass cylinder containing a clear liquid and a series of objects whose densities are designed to sink in this sequenceglasscylinderliquid The temperature is typically read from an engraved metal disc on each bulb The Galileo thermometer works due to the principle of buoyancybuoyancy GALILEO THERMOMETER

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