Chapter 8 - Temperature and Thermometers Flashcards
Two breaker of DIFFERENT size contain water, larger one and smaller one, are heated with the SAME amount of heat for EQUAL length of time, Which breaker become hotter faster?
The smaller breaker.
If BOTH breakers,A larger one and a smaller one, are at the same temperature, which breaker contains more heat?
The larger breaker
Is a tiny drop of hot water more dangerous or a cup of hot water? Why?
A cup of hot water as it contains much more thermal energy
S.I Unit for temperature?
Kelvin
S.I Unit for heat
Joule HEAT is a form of ENERGY
When does heat flows?
When there is a temperature difference
Every thermometer base on a physical property, how is this physical property changes with temperature
The physical property is linearly and continuously with temperature
Liquid-in-glass thermometer is based on what thermometric property?
Volume
Bimetallic thermometer is based on what thermometric property?
Volume (Expansion of metal)
Resistance thermometer is based on what thermometric property?
Electrical resistance
Thermocouple is based on what thermometric property?
Electrical Voltage
Definition of ice point
It is the lower fixed point. It is the temperature of pure melting ice at one atmosphere, and is assigned a value of 0 degree celcius
Definition of steam point
It is the higher fixed point. It is the temperature steam from water boiling at atmosphere and is assigned a value of 100 degree celcius
What is the lowest possible temperature in degree Celsius?
-273 degree celsius
How is Kelvin related to Degree Celsius? Equation?
Kelvin = Degree Celsius + 273
What are the 3 Steps for constructing a scale on a thermometer (Calibration)?
- Step 1: Choose a thermometric substance e.g Mercury
- Step 2: Choose two fixed points, usually the ice point and the steam point and mark them on the apparatus. In order to mark the points, the apparatus has to place in ice and in steam, to show that where are the points
- Step 3: Divide the interval between the two points into a fixed number of equal parts e.g 100 parts for degree celsius
what are the five conditions for a good thermometer?
- Has an easy-to-read scale
- Is safe to use
- Responsive to temperature change
- Sensitive to small temperature change
- Able to measure the required range of temperature
What is the formula to calculate unknown temperature?
Temp. = PPx - PPzero / PP100 - PPzero X 100
