Chapter 8 - Temperature and Thermometers

Question 1

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?

Answer 1

The smaller breaker.

Question 2

If BOTH breakers,A larger one and a smaller one, are at the same temperature, which breaker contains more heat?

Answer 2

The larger breaker

Question 3

Is a tiny drop of hot water more dangerous or a cup of hot water? Why?

Answer 3

A cup of hot water as it contains much more thermal energy

Question 4

S.I Unit for temperature?

Answer 4

Kelvin

Question 5

S.I Unit for heat

Answer 5

Joule HEAT is a form of ENERGY

Question 6

When does heat flows?

Answer 6

When there is a temperature difference

Question 7

Every thermometer base on a physical property, how is this physical property changes with temperature

Answer 7

The physical property is linearly and continuously with temperature

Question 8

Liquid-in-glass thermometer is based on what thermometric property?

Answer 8

Volume

Question 9

Bimetallic thermometer is based on what thermometric property?

Answer 9

Volume (Expansion of metal)

Question 10

Resistance thermometer is based on what thermometric property?

Answer 10

Electrical resistance

Question 11

Thermocouple is based on what thermometric property?

Answer 11

Electrical Voltage

Question 12

Definition of ice point

Answer 12

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

Question 13

Definition of steam point

Answer 13

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

Question 14

What is the lowest possible temperature in degree Celsius?

Answer 14

-273 degree celsius

Question 15

How is Kelvin related to Degree Celsius? Equation?

Answer 15

Kelvin = Degree Celsius + 273

Question 16

What are the 3 Steps for constructing a scale on a thermometer (Calibration)?

Answer 16

1. Step 1: Choose a thermometric substance e.g Mercury
2. 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
3. Step 3: Divide the interval between the two points into a fixed number of equal parts e.g 100 parts for degree celsius

Question 17

what are the five conditions for a good thermometer?

Answer 17

1. Has an easy-to-read scale
2. Is safe to use
3. Responsive to temperature change
4. Sensitive to small temperature change
5. Able to measure the required range of temperature

Question 18

What is the formula to calculate unknown temperature?

Answer 18

Temp. = PPx - PPzero / PP100 - PPzero X 100