Transcript PHYSICS - SCIENCE for YOU

PHISICS
Created by :
VIA WINDI HERAWATI
Class : VII – B
No. : 26
Table of Contents
A.
C.
D.
D.
 Advantage of Alcohol thermometer
 Advantage of Mercury thermometer
 Disadvantage of Alcohol Kinds of Thermometers
thermometer
 Disadvantage of Mercury thermometer
Graphs
A. Kinds of Thermometers
1. Clinic Thermometer
Physical Properties :
• This thermometer is usually used to
measure a human body temperature
• The tube of the thermometer is filled with
mercury
• The scale of the thermometer is designed
from 35oc until 42oc
• In clinic thermometer there is found the
part of capillary tube which is narrowing
2. Wall Thermometer
Physical Properties :
• This thermometer is used to measure a room
temperature
• Usually the thermometer is set on straight
position on wall in a room
• The wall thermometer of the measurement has two
measurement scale, those are Celsius and
Fahrenheit scale
3. Six – Bellani Maximum and Minimum
Thermometer
Physical Properties :
• This thermometer is used to measure a
maximum temperature, mainly inside glass
house used for plantation as research object
• The thermometer consists of alcohol (now it is
used creosote oil), mercury, and small steel
pointer which is equiped by light spring as it
is holder
B. Advantage of Alcohol and Mercury Thermometer
1. Advantage of Alcohol Thermometer
Advantage :
• They are cheap
• They can be seen clearly as they are in red in
color
• They are thermometric liquids
• It can measure a low temperature, because its
freezing point is low (-115oc)
• It can measure the temperature precisely,
because it has large expansion coefficient
• Its expansion is regular
2. Advantage of Alcohol Thermometer
Advantage :
• It can measure the temperature quickly and
precisely
• It is does not make wet the wall of its place
• It has a visible meniscus, because its color is
silvery shining.
• Its can measure high temperature, because its
boiling point is high (365,9oc).
C. Disadvantage of Alcohol and Mercury Thermometer
1. Disadvantage of Alcohol Thermometer
Disadvantage :
• It cannot measure a high temperature,
because its boiling point is low (78oc).
• Its make wet the of its place
• It is colorless so it must be given dyestuff in
order to be visible
• They have less surface tension
• They have less density
2. Disadvantage of Mercury Thermometer
Disadvantage :
• It cannot measure very low temperature, because
its freezing point is high (-40oc).
• Mercury is poisonous, so it is harmful if its tube
is broken
• Its price very high
D. Graph
1. Bar graph
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Money spent (in millions)
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2. Line graph
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Percentage of total land