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CHAPTER 4 : HEAT

4.1: Thermal Equilibrium(Keseimbangan terma)

1Chapter 4 : Heat

# 4.1 : Thermal equilibrium

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Block A is hot and block B is at room temperature.What will happen to the temperature of the blocks if the

two blocks are in direct physical contact?

2

98C

Block A Block B

27C

Chapter 4 : Heat# 4.1 : Thermal equilibrium

Thermal Equilibrium

? C ? C

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3

Block A (Hot) Block B (Cold)

Faster rate of

energy transfer

from A to B

Slower rate ofenergy transfer

from B to A

The hot block A heat while cold block B

. heat.

Temperature of block A decreases, the temperature of

block B increases.

The net result is the transfer of heat energy from the

object. Chapter 4 : Heat# 4.1 : Thermal equilibrium

Thermal Equilibrium

releases

absorbs

hot object to the cold

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5

When two objects are in thermal equilibrium;

There is . between two objects.

Two objects have the . .

Chapter 4 : Heat# 4.1 : Thermal equilibrium

Thermal Equilibrium

no net flow of heat

same temperature

PHYSICS IS FUN!

0 C = 273 K

Unit for temperature:

Fahrenheit, FKelvin, K

Celsius,C

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6Chapter 4 : Heat# 4.1 : Thermal equilibrium

Example of Thermal Equilibrium

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7Chapter 4 : Heat# 4.1 : Thermal equilibrium

Example of Thermal Equilibrium

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

8

Liquid-in-glass Thermometer

How liquid in glass works?

The bulb contains a fixed mass of liquid such as

When the liquid absorb heat it will . and rise

in the capillary tube.

Therefore the of the liquid in the capillary tube

indicates the of the temperature

mercury

expand

length

magnitude

1

2

3

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

9

Liquid-in-glass Thermometer

How a thermometer is calibrated?

A temperature scale is obtained by choosing

two temperatures, called the fixed point.

Fixed point Definition Value

Lower point:

Ice point

The temperature of pure

melting ice

0C

Upper point:

Steam point

The temperature of steam

from water that boiling

under atmospheric

pressure

100C

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

10

Liquid-in-glass Thermometer

The range between the fixed points is divided into100 equal divisions and each division equal 1C. The

thermometer is calibrated and ready for use.

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

11

Liquid-in-glass Thermometer

temperature, = 0

100 0x 100C

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

12

Liquid-in-glass Thermometer

Calculate the value of temperature, T.

Ans:T = 57C

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The characteristics of the liquid used in liquid-in-glass

thermometer:

................................. over a wide range of temperature

. to the glass wall of the capillary tube.

13Chapter 4 : Heat# 4.1 : Thermal equilibrium

Liquid-in-glass Thermometer

Easily seen

Expand and contract

Not stick

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Quick test 1

15Chapter 4 : Heat# 4.1 : Thermal equilibrium

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T = 248 K

Chapter 4 : Heat# 4.1 : Thermal equilibrium

16

Ans:

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

17

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Chapter 4 : Heat# 4.1 : Thermal equilibrium

18

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End~

Homework:

Buku Bank page 68 question no. 1 -11

and page 78 question no. 1 .

19Chapter 4 : Heat# 4.1 : Thermal equilibrium