I've previously written up an experiment here before but I think i will rewrite it and perhaps change some of my aim, hypothesis and method. It seemed too simple before.
AIM: To investigate if different brands of popcorn will leave different amounts of unpopped kernels.
HYPOTHESIS: Different brands of popcorn will leave different amounts of unpopped kernels.
EQUIPMENT: Three packets of popcorn from three different brands (I've only bought Uncle Toby's so far, but I will buy the rest later when i find the brands with the same popping method and flavour), a 850W microwave.
RISK ASSESSMENT:
Identify: Umm, the heat and pressure from the microwave.
Assess: The heat and pressure from the microwave could cause the popcorn to overheat and an explosion may occur inside the microwave. Yes?
Control: Make sure the time set for the kernels popping is no longer than necessary, if signs of overheating is seen, stop the microwave.
Disposal: uhh, well you can't really dispose a microwave but you should throw the popcorn out when finished with it.
METHOD:
1. Collect and set up equipment.
2. Remove plastic wrapper from the popcorn packaging and place bag in the centre of the microwave with correct side up.
3. Set microwave on HIGH for 2 minutes and 30 seconds (time recommended for 850W microwaves)
4. Press start and listen for the corn starting to pop. When the popping slows to around 1-2pops per second, stop the microwave.
5. Observe the process.
6. Leave bag to cool for 30 seconds and remove from microwave.
7. Count and measure the number of unpopped kernels for the brand and record results.
8. Repeat experiment.
9. Compare and analyse results.
Ohmygosh. I know my experiment sounds really simple and pointless but i'm planning to analyse it in detail so stress less! My discussion will be good, i hope. (:
Monday, 10 May 2010
Sunday, 9 May 2010
I do blog regularly, see?
So i'm feeling quite bored at the moment and I thought, yeah why not blog. This is completely unrelated to science by the way, It's just to show off that yes, i do blog regularly!
I have to go buy popcorn soon to start my experiment, my microwave still smells like popcorn from the last time i popped it. Oops.
I have to go buy popcorn soon to start my experiment, my microwave still smells like popcorn from the last time i popped it. Oops.
Simple, no?
So I decided my experiment is too simple and because I cannot be bothered changing my aim, hypothesis and essentially my whole experiment, i decided to just analyse the microwave and how it manages to pop the popcorn kernels as well as how they pop. So here's some research about that.
Microwaves heat food using dialectric heating (also known as electronic heating, RF heating and high frequency heating), which is the process in which radiowave or microwave electromagnetic radiation heats a dielectric material. Yeah, by the way a dielectric is an electrical insulator that may be polarized by the action of an applied electric field.
Umm anyways, so the microwave uses microwave radiation to heat water and other polarized molecules in the food. This excitation is fairly uniform, leading to food being more evenly heated, except for thick objects.
A microwave oven works by passing non-ionizing microwave radiation, usually at a frequency of 2.45 gigahertz (GHz)—a wavelength of 122 millimetres (4.80 in)—through the food. Microwave radiation is between common radio and infrared frequencies. Water, fat, and other substances in the food absorb energy from the microwaves dielectric heating. Many molecules (such as those of water) are electric dipoles, meaning that they have a positive charge at one end and a negative charge at the other, and therefore rotate as they try to align themselves with the alternating electric field of the microwaves. This molecular movement represents heat which is then dispersed as the rotating molecules hit other molecules and put them into motion.
A common misconception is that microwave ovens cook food "from the inside out". In reality, microwaves are absorbed in the outer layers of food in a manner somewhat similar to heat from other methods. The misconception arises because microwaves penetrate dry non-conductive substances at the surfaces of many common foods, and thus often induce initial heat more deeply than other methods.
Umm anyways, so the microwave uses microwave radiation to heat water and other polarized molecules in the food. This excitation is fairly uniform, leading to food being more evenly heated, except for thick objects.
A microwave oven works by passing non-ionizing microwave radiation, usually at a frequency of 2.45 gigahertz (GHz)—a wavelength of 122 millimetres (4.80 in)—through the food. Microwave radiation is between common radio and infrared frequencies. Water, fat, and other substances in the food absorb energy from the microwaves dielectric heating. Many molecules (such as those of water) are electric dipoles, meaning that they have a positive charge at one end and a negative charge at the other, and therefore rotate as they try to align themselves with the alternating electric field of the microwaves. This molecular movement represents heat which is then dispersed as the rotating molecules hit other molecules and put them into motion.
A common misconception is that microwave ovens cook food "from the inside out". In reality, microwaves are absorbed in the outer layers of food in a manner somewhat similar to heat from other methods. The misconception arises because microwaves penetrate dry non-conductive substances at the surfaces of many common foods, and thus often induce initial heat more deeply than other methods.
I will combine this research with my popcorn research later on in my discussion in my actual experiment report. Oh man, I really need to start worrying about my experiment now... i want to change my aim because it seems overly simple but could I simply analyse the variables at a Year 10 level and still carry on counting kernels? Pleaaase Ms Zhang?
Hmm, i should stop procastinating and blog more. Bye (:
Hmm, i should stop procastinating and blog more. Bye (:
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