Blog#3 Liquids Can Be Thick or Thin (Lab experiement)


 
Title of Experiment:
The effect of temperature on flow rate of cooking oil
Question:
Does temperature affect the viscosity of oil? If so, how? How can this change be measured?

 
Hypothesis:

The change in viscosity as temperature of vegetable oil changes.  As the temperature of vegetable oil increases, the flow rate becomes faster, because according to particle theory, when particles get heat, it gains energy and move faster than usual. As the temperature of vegetable oil decreases, the flow rate also becomes slower because particles gain less energy comparing to higher temperature.

                                                            Materials
 For do this experiment we needed cooking oil, beaker, thermometer, measuring cylinder, retort stand, ring clamp, plastic cup, hot plate, ruler,and stopwatch.



<>  Result: <>  <> 

 
Oil Temperature

 

 
20-24°C(20°C)

 

 
5-9°C (9°C)

 

 
52°C

 

 
Time

 

 
30second

 

 
52.7second

 

 
12.2second

 

 
Flow Rate

 

 
1.6ml (1.dp) per second

 

 
0.95ml (Rounded up to 2
  decimal place) per second

 

 
4.098ml per second (3.dp)

 

 
Appearance

 

 
Color- light Yellow

 
Clear (Transparent)

 
Greasy/ Slippery

 


 

 
Color- light yellow

 
Clear, but contains few
  frozen mass.

 
 Greasy/ Slippery

 

 
Color-light yellow

 
Not very clear (Translucent)
 

 
A beaker is not transparent
  due to water vapour, we cannot see through the beaker.

 
Producing vapour

 








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Blog #3 Measuring Matters (volume/mass/weight + density)

Matter: Anything that has mass and takes up space (Volume)
Volume: Measure of how much space an object takes up

Common Measurements:(cm3, m3, km3, mL, L  )

How to measure?

Regular shaped
objects (Rectangle) – Use a formula
(V=l×w×h)


Liquids- Use glassware (Graduated Cylinder)









Irregular shaped object- Use principal of displacement ( Vobject= Vobject+ water - Vwater  )

Mass: measure of how much matter an object contains
Common measurement: kg, g, ton, mg

How to find- Scale

Weight: Direct measurement of the force (Pull) of gravity on an object
Common measurement: N (Newton)

How to measure?

Use formula: Fg= mg
Mass= m Gravity= g         
g= 9.81m/s²


Density: Mass per Volume, How much something has compared to its volume
Common units: g/mL , g/cm3, kg/mL,kg/m3
How to measure?
Use formula: D=m/v


Buoyancy: Force that helps you floats, upward force on an object in a fluid
Common measurement: N (Newton)
How to find?
Archimedes Principle
(FB = Dl × Vl × g) FB= Force of buoyancy


3 types of Buoyancy











Positive buoyancy: Objects that are less dense than a fluid will float
Neutral buoyancy: Neutrally buoyant objects neither float nor sink. Instead, they flowing in the water. In order to be neutrally buoyant, an object must have the same density as the fluid it's placed in.

Negative buoyancy: Objects that are denser than a fluid will sink










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Blog#4 Buoyancy and floating Objects

“Why does a lump of clay sink in water, but float when it is a different shape?”


If you put a lump of clay in to water, what would you expect to be happen? Will clay float
or sink? The answer is obviously will sink due to its greater density than water.
But can you believe that clay can be float if you change its shape?


If you make clay into certain shape which is able to contain air such as boat-shape can float.


Because the shape
of clay contains air which has lower density than water, the average density of
clay and air is less than water. So it can float.







 


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Blog #2 Aerodynamic and hydrodynamic systems

Key Terms

  • Aerodynamic: Flow of air around solid objects or the effect on moving objects
  • Laminar Flow: Liquid under pressure in a hyedraulic system that makes system to work
  • Turbulent Flow: A broken or choppy movement of water usually caused by fast whirlpool.
  • Drag: Force that mkaes body slow when it is moving through a liquid
  • Streamlined: A smoothly curved narrow shape which allows an object moving slowly throgh a fluid


RESEARCH ASSIGNMENT

TASK:  Find an example which is built to minimize air resistence

Topic: Golf Ball



When golf was first invented, the golf ball was a smooth surfaced, spherical ball, and very few people liked golf because this kind of ball was always too hard to control its spin and direction. So in old time, only highly skilled players were able to play the game and even they could not play well as players in now a day. This problem was caused by the ball. The smooth surface which makes greatest air resistance, would effect by even a breeze and send the ball out of track.

Because of these reasons, many people tried to minimalize the air resistance
of the golf ball, and they finally succeeded when they introduced small pits on
the ball’s surface.  






This is because that pits on the ball’s surface traps air and it is this same air that creates a turbulent layer on the ball's surface making the air flow around the ball which reduce the air resistance






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Blog 1 non-Newtonian fluids experiment


Question: Can a case filled with
non-Newtonian fluid support my weight as I run across its surface or step on?  How does viscosity affect fluidity?


Hypothesis: A case filled with non-Newtonian
fluid (Mixture of water and starch) can support my weight.

This experiment you will need:
  •  Corn starch
  • water
  • Food coloring
  • a case for mixing (Huge enough to step in)
  • Towel/ tissue/ newspaper (you don't have to prepare all of these)
Procedure:



1.     Pour water approximately 1/4 of
case (deep enough to sink your feet) then pour starch several bags of starch.


2.     Keep stirring it as adding
starch and water in small amounts until you get a mixture similar to honey.


3.     Sink your hand into the case
and move your hand around slowly and then very quickly. If you can’t pull your
hand out from the mixture as you pull your hand very fast, it’s done!



4.     Try to grab the fluid, step on
it, run across it… Have Fun!





Conclusion: The viscosity, the measurable
thickness or resistance to flow  of this mixture is high. The fluid
could support my weight which means that the visocisty of this fluid is high enough to handle a human's weight.




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