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# The Effect of Temperature on Viscosity

Maraam Haque, Johnson Gao, Tahseen Fairuz and Margaret Gu
by

## Maggie Gm

on 3 October 2012

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#### Transcript of The Effect of Temperature on Viscosity

Different liquids have different properties. One of these properties is viscosity, the liquid's resistance to flowing. Water, milk, and fruit juice are comparatively thin and flow more easily than thicker, more viscous liquids such as honey, corn syrup, shampoo, and liquid soap.So in this investigation, we're going to study the viscosity of a more viscous liquid, shampoo, when it's heated or cooled. THE EFFECTS OF TEMPERATURE ON VISCOSITY INTRODUCTION Purpose To investigate the effects of the change in temperature on the viscosity of shampoo. Controlled Variable Been in fridge for 12 hours Heated Hypothesis The higher the temperature the lower the viscosity, the lower the temperature the higher the viscosity because when the temperature of a substances goes up the particles move faster and further apart which will then increase the flow rate. Step 1 1. Put on your safety goggles and measure 100ml of room temperature shampoo into a graduated cylinder and make qualitative observations of the clarity and colour. Step 2 2.Pour the room temperature shampoo from the graduated cylinder to the beaker and time it to find the viscosity (viscosity = ml/s) and test and record this four times. Step 3 3.Repeat step 1 but heat up the shampoo inside the Pyrex bowl with the hot plate until it reaches 60°C – use the thermometer to check the temperature reaches (same temperature 60°C as chosen before which we still don not know at this point). Step 4 4.Pour the heated shampoo from the graduated cylinder to the beaker and time it to find the viscosity (viscosity = ml/s) and test and record this four times. Step 5 5.Repeat step 1 but this time use shampoo straight from the fridge at 4°C. Step 6 6.Pour the cold shampoo from the graduated cylinder to the beaker and time it to find the viscosity (viscosity = ml/s) and test and record this four times. Step 7 7. Compare and graph your results The results of the experiment state that the shampoo at 4°C had the slowest flow rat, at room temperature (the control group) the flow rate was in between the shampoo at 4°C and the one at 60°C. The one at 60°C had the fastest flow rate. To find the average flow rate of each shampoo specimen we must calculate the averages:

(52+50+40+40)/4= 45.5mins is the average flow rate
(8+8+20+20)/4= 14mins is the average flow rate
(1.67+4.8+1.6+2)/4 = 2.5175s is the average flow rate

Hot plate
Fridge
Beakers (1)
Timer
Safety Goggles
Thermometer
Pyrex Bowl
Funnel (2) COLOUR CLARITY LUSTRE TEST 1 TEST 2 TEST 3 TEST 4 COLD SHAMPOO
4 DEGREES ROOM TEMP.
20 DEGREES HEATED SHAMPOO
60 DEGREES Dark, royal
blue Opaque
– very thick Very dull 20ml/52 min 20ml/50 min 20ml/40 min 20/ 40 min Light ocean
blue Translucent – very dense
though, a little more opaque
than translucent Translucent –
very clear Light peacock blue,
but slowly transitioned