Different Scales of Temperature

Transcript

Different Scales for measuring TemperatureTemperature is measured in :- Scale Symbol Celsius °C Fahrenheit °F Kelvin K Here, we use degrees like degree Celsius , degree Fahrenheit We don’t use degrees with Kelvin Which measurement is usually shown by Clinical Thermometer?We normally take measurement in Fahrenheit (but in book it is mentioned Celsius) If a Person is Normal It is around 98.6 °F ( 37 °C ) If a Person is Sick It is more than 98.6 °F Example - 102 °F ( 38.9 °C ) What is Normal Temperature Range for Human Body?Normal Temperature In Fahrenheit 37.0 °C In Celsius 98.6 °F How to Convert Fahrenheit into Celsius and Vice versa ? To convert Fahrenheit to Celsius, use the formula:To convert Celsius to Fahrenheit, use the formula:To convert Fahrenheit to Celsius, use the formula: 𝑪 =(𝑭 – 𝟑𝟐) 𝟓/𝟗 Subtract 32 from the Fahrenheit temperature. Multiply the result by 5. Divide by 9 to get Celsius temperature. Example: Convert 98.6 °F to Celsius. (98.6 – 32)×5/9=(66.6)×5/9=37 °𝐶 To convert Celsius to Fahrenheit, use the formula: 𝑭=𝟗/𝟓 𝑪+𝟑𝟐 Multiply the Celsius temperature by 9. Divide the result by 5. Add 32 to get Fahrenheit temperature. Example: Convert 37 °C to Fahrenheit. (37×9/5 )+32=66.6+32 =98.6 °𝐹 What is SI Unit of Temperature?It is kelvin How to convert kelvin into Celsius and Vice – Versa ? It is denoted by symbol K To convert kelvin to Celsius, use the formula: Subtract 273.15 from the kelvin temperature. 𝑪 =𝑲 –𝟐𝟕𝟑.𝟏𝟓 Example: Convert 300 K to Celsius. 300−273.15=26.85 °𝐶 To convert Celsius to kelvin, use the formula: Add 273.15 to the Celsius temperature. 𝑲=𝑪+ 𝟐𝟕𝟑.𝟏𝟓 Example: Convert 25 °C to Kelvin. 25+273.15=298.15 𝐾 Correct and Incorrect Method to show Different ScalesCorrect Way 37 degree Celsius or 37 °C 98.6 degree Fahrenheit or 98.6 °F 300 kelvin or 300 K Wrong Way 37 37 C 37°C 98.6 98.6 F 98.6°F 300 300 °K 300 k Problems with using Clinical Thermometer Problem with using Mercury Thermometer :- Difficult to read because it uses a thin mercury line It can break easily and mercury is poisonous Problem with using both Mercury and Digital Thermometer :- They have a Limited Range normally between 35 °C to 45 °C They cannot be used to measure a lower or higher Temperature Example – We can’t measure with Clinical Thermometer Boiling Point of Water - 100 °C Melting Point of Ice - 0 °C