Types of Thermometer


 
 
Concept Explanation
 

Types of Thermometer

Thermometer:

Thermometer is a device which is used to measure temperature. Thermometer is made of a long narrow glass tube; with a bulb at one end. The narrow tube appears as a continuous silver line; because it is filled with mercury. Mercury is a metal which is in liquid state at room temperature and it readily expands or contracts at the slightest change in temperature. Hence, mercury is used in thermometer.

Types of Thermometer:

A.    Laboratory Thermometer: Laboratory thermometer is used to measure the temperature. The scale of temperature is graduated generally from –10°C to 110°C over the glass tube. Each division of temperature scale is further divided into 10 parts to read fraction of temperature.

                                         

B. Clinical Thermometer: Clinical thermometer is used to measure the body temperature. The scale of temperature is graduated from 35°C to 42°C and or from 94°F to 108°F. The temperature of human body always remains within this range and this is the range on the clinical thermometer. There is a kink make near the bulb of clinical thermometer which prevents the automatic fall of mercury level.

                                                                                  

C.    Digital Thermometer: In digital thermometer, reading of temperature is displayed digitally as in digital watches. This is safer because no mercury is used in this. It is important to note that mercury is a highly toxic substance.

                                       

D.    Maximum-Minimum Thermometer: Maximum – minimum thermometer is used to measure the daily temperature to prepare weather reports.

                                            

Difference between clinical and laboratory thermometer

Reading of thermometer and measuring of temperature:

•    Take a clinical thermometer and hold it horizontally with reading scale towards your eye.

•    Do not hold the thermometer from the bulb.

•    Rotate the thermometer slightly clockwise and anticlockwise. By doing this you will see a shiny thin silvery thread.

•    The end of the silvery thread shows the reading of temperature. If mercury lining ends at 37, the reading is 37°C.

•    Wash the bulb end of thermometer with an antiseptic solution.

•    Give two or three jerks slightly. By doing this the mercury level would fall. When it falls to 35°C or below, put it below the tongue and wait for one minute.

•    Take out the thermometer and read the temperature. Temperature would be near 37°C.

•    The normal body temperature is 37°C. This can differ from person to person.  

Use of Laboratory Thermometer:

•    Take some water in a beaker.

•    Take a laboratory thermometer and immerse its bulb end in water; holding it vertically. Ensure to dip whole portion of bulb end. The bulb end should not touch the bottom or side of the beaker.

•    Observe the movement of rise of mercury. When it becomes stable, take the reading of the thermometer.

•    Repeat this with hot water and take the reading.

The range in terms of Fahrenheit on the body of the thermometer is between 94^{circ}C to 108^{circ}C. Human body temperature on the Fahrenheit scale is 98.4^{circ}F and in the Celsius scale it is 37^{circ}C. Clinical thermometer is made up of glass tube and a liquid ( mercury or alcohol or hydrocarbon based fluid) is filled inside it. As the temperature increases, volume of the mercury expands. Division on the body of the thermometer shows the increase in temperature.

Galileo was the first scientist to construct a thermometer based on the thermal expansion and he called his thermometer the thermoscope.

 

Sample Questions
(More Questions for each concept available in Login)
Question : 1

The normal temperature of human body is :

Right Option : B
View Explanation
Explanation
Question : 2

In a  laboratory thermometer the scale of temperature is graduated generally from ____________________ over the glass tube .

Right Option : C
View Explanation
Explanation
Question : 3

In the clinical thermometer the scale of temperature is graduated from ___________________  or from 94°F to 108°F.

Right Option : B
View Explanation
Explanation
Chapters
Simple Harmonic Motion
Cytology
Classifucation Of Plants
Structural Composition Of Plants
Nutrition In Plants, Harmones And Plant Disease
Ecosystem
Classification In Animals
Nutrition In Animals
Human Digestive System
Human Respiratory System
Human Skeleton System
Human Excretory System
Human Nervous System
Human Circulatory System
Human Endocrine System
Human Reproductive System
Genetics
Human Diseases
States Of Matter
Metals And Non Metals
Acid Bases And Salts
Periodic Classification
Fuel, Combustion And Flame
Environmental Chemistry
Rest And Motion
Work Power And Energy
Gravitation
Pressure And Its Effects
Sound and Waves
Heat And Temperature
Light - Reflection
Electricity And Magnetism
Modern Physics
Force And The Laws Of Motion
Light - Refraction
Dispersion And Human Eye
Magnetic Effect Of Electric Current
Atom And Molecule
Pre-Historic Period
Indus Valley Civilization
Vedic Civilization
Religious Reform Movement
The Early Kingdoms
The Mauryan Empire
Post Mauryan Period
The Age Of The Guptas
Post Gupta Era
Age of Rajput
Khilji Dynasty
Slave Dynasty
Tughlaq and Sayyid Dynasty
Vijaynagar Empire And Bahamani Kingdom
Mughal Empire And Beyond
Lodhi Dynasty
Cholas, Chalukyas and Pallavas
Arab Invasions
Bhakti and Sufi Movement
Rise of Sikhs, Jats and Marathas
Administrative Structure of Delhi Sultanate
Architecture During Medivial India
Advent Of The Europeans
Post Mughal Period
Rise of New States in 18th Century
Growth of British Paramountacy
Socio Religious Reforms
Constitutional Development of India
Indian Struggle Against British Rule
The Revolt Of 1857
Education Under British Rule
Role of Press in Freedom Struggle
First Phase of National Movement
Second Phase of National Movement
Third Phase of National Movement
Constitutional Development in India
Constituent Assembly
Union And Its Territory
Structure of Indian Constitution
Fundamental Rights and Duties
The Union Executive
The Union Legislature
Constitutional Amendments and Provisions
Judiciary In India
Emergency Provisions
Center - State Relations
The State Executive
The State Legislature
Election Commission Of India
Constitutional Organisation
Non-Constitutional Organisation
Local Self Goverment
India - Size And Location
Geological History Of India
The Physical Features Of India
Climate Of India
Soils In India
Natural Vegetation
Windlife Conservation In India
Drainage System of India
Irrigation System Of India
Agriculture In India
Livestock And Fisheries In India
Minerals And Energy Resources In India
Means Of Transport In India
Major Industries In India
Tribes of India
Census of India 2011
Music
Dance
Theatre
Pantings
Art, Architecture & Culture of India
Bio-Diversity
Earth And Its Structure
Land Rock And Soil
Atmosphere, Climate And Weather
Oceanography
Human And Regional Geography
Economic Growth And Development
Sectors Of Indian Economy
Economic Planning Of India
Fiscal And Monetary Policy In India
Infrastructure In India
Effects Of British Rule On Indian Economy
National Income
Banking System In India
Poverty And Unemployment
Inflation And Trade Cycles
Major Institutions
Environmental Studies
Chemistry In Everyday Life
Units And Dimensions
Tissues In Organism
Content / Category
Class / Course
 
 


Students / Parents Reviews [10]