• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# THermal Physics Lab

Extracts from this document...

Introduction

Ankit Shahi                September 24 2009

 Thermal Physics lab

The aim of the experiment is to find the total heat energy lost, Q, (in joules) from hot water and hot milk when placed in a cooler in two different separate troughs for 1800 seconds (30 minutes) at equal cooler temperature. This will be done by taking equal volume of hot water and hot milk in two separate troughs and then measuring their temperature, T, every 180 seconds (3 min.) for 1800 seconds (30 minutes) by using a thermometer.

Using the formula of Q = ρ m C(p) (T₂ - T₁) the heat energy lost can be found, where ρ is the density of the liquid, m is the mass of the liquid, T₁is the room temperature in Celsius, T₂ is the temperature of the liquid in Celsius and Q is the heat energy lost (in Joules). C is the specific heat capacity which is measured in J / Kg K for both liquids.

Heat is a form of energy that is transferred by a difference in temperature. The temperature of both liquids should decrease because the heat from both the liquids would be transferred to the cooler and thus the liquids would lose heat.

Middle

+ 1ºC)

180

29

32

1

360

26

29

2

540

23

25

3

720

21

24

5

900

19

22

6

1080

19

21

7

1260

18

21

9

1440

17

19

10

1620

15

18

12

1800

15

18

14

Calculating heat loss for water:

Density of water = 1 Kg/L (in the calculations below the density of water is rounded to 1 Kg/L. The density of water changes with the temperature. Also, note that the temperature of the cooler represents T₁ in the formula)

Specific heat capacity: 4186 J/ Kg K

Q = ρ m C(p) (T₂ - T₁)

Q = (1kg/ L) (0.500 L + 0.005) (4186 J/ Kg K) (26 + 1ºC – 2 + 1ºC)

Q = -50232 J

The heat is in negative because the hot water has lost its energy or in other words it has got colder. Therefore the heat energy lost is in negative. Also, the density of the water changes with temperature. For example at 20 degrees Celsius it is 0.9982 kg/L while on 22 degrees Celsius it is 0.997 kg/L

Error for heat loss:

The uncertainty for the specific heat capacity would not be taken into consideration while calculating the error since the specific heat is a constant (a calculated value)

(0.005 / 0.500) + (2/24) * 50232 = 840 J

Calculating heat loss for water:

Density of milk = 1 Kg/L (in the calculations below the density of milk is rounded to 1 Kg/L. The density of water changes with the temperature.)

Specific heat capacity: 3770 J/ Kg K

Q = ρ m C(p) (T₂ - T₁)

Q = (1kg/ L) (0.500 L) (3770 J/ Kg K) (29 – 2) ºC

Conclusion

Evaluation:

This lab was a success. This can be seen from the equal temperature change and the total heat energy lost from both water and milk. But there were big errors found with the heat energy lost. This could be a result of the temperature of the troughs. The temperature of the troughs could affect the temperature change and thus it could bring errors. Another problem would be the color of the apparatus. If the apparatus is black in color, for example, it would absorb more rather than give off energy

Improvements:

To solve these problems, make sure that the color of the instruments used should be the same so that there would be no other things that affect the heat lost. Also, the temperature of the troughs should be the same. The temperature should be measured by using a thermometer.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related International Baccalaureate Physics essays

1. ## IB Latent Heat of Fusion of Ice Lab

the experiment are:- * Extra heat generated within the system due to friction when the stirrer was shook up and down. * The system wasn't a perfect insulator and therefore, heat might have been lost to the surroundings. * Not all the ice might have melted.

2. ## IB Specific Heat Capacity Lab

MC � 0.01 41.35 41.35 41.35 2 Mass of Calorimeter + Water ( g ) MC + Mw � 0.01 103.75 105.70 102.82 3 Mass of Water ( g ) Mw � 0.02 62.40 64.35 61.47 4 Mass of metal bob ( g )

1. ## Energy density experiment - Aim: To determine the energy density of ethanol

Graph 2. Max and min The above graph shows the maximum and minimum gradient which shows the maximum and minimum result of the energy density of ethanol from this experiment. The maximum value of energy density is 16,785,412.06 J kg-1 and the minimum value is 14,895,228.86 J kg-1.

2. ## Ohm's Law lab

water has a very high specific heat capacity and absorbs any heat evolved. This cannot be done for the bulb as due to the glass covering and it being filled with an inert gas, the filament still heats up. The formula for calculation of resistance imply standard temperature and pressure i.e.

1. ## HL Physics Revision Notes

The molecules vibrate about a fixed position. The higher the temperature the greater the vibrations. Liquids: Fixed volume but shape can change. Molecules are vibrating but not completely fixed in position, still strong forces between molecules. Gases: Not fixed volume or shape, will expand to fill the container.

2. ## Researching water turbine designs.

The double regulation allows, at any time, for the adaptation of the runner and guide vanes coupling to any head or discharge variation. It is the most flexible Kaplan turbine that can work between 15% and 100% of the maximum design discharge.

1. ## IB Specific Heat Lab

56.25° C ± .05 Initial Temperature of Water: 24.5° C ± .1° Tin Temperature of Metal: 29.5° C ± .1° Mass of Metal: 70.50° C ±

2. ## Rolling objects down a ramp Physics LAB

It made it much longer because we had to convert inches into centimeters to sub in into our formulas. If we had made a wooden ramp with supports (posts) going from the floor to the highest point of the ramp and the other side resting on the ground it would • Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to 