Brooke Martin
Blowing out a candle with a balloon is a fun experiment that can be done at home. It involves using a balloon to extinguish a candle flame without touching it. This experiment demonstrates the concept of heat conduction and the heat capacity of water. By adding water to the balloon, the heat from the candle flame is absorbed by the water, preventing the balloon from popping. This simple experiment can be a great way to introduce children to the fascinating world of science and teach them about heat transfer and the properties of different substances.
| Characteristics | Values |
|---|---|
| Objective | Blow out a candle with a balloon |
| Materials | Candle, balloons, water, scissors, matches, plastic cup |
| Procedure | 1. Cut about 1/3 of the bottom of the balloon. 2. Tie the mouth of the balloon. 3. Stretch the cut balloon across the mouth of the plastic cup with the knotted end sticking out. 4. Place the candle on a flat surface and light it. 5. Stand about one foot away and use the knotted end of the balloon to pull back. 6. Aim at the candle and let the balloon go. |
| Science Behind the Experiment | Water has a much higher heat capacity than air, meaning that it takes a lot more energy to heat up water than it does to heat up the air. The water absorbs the heat from the flame and pulls it away from the latex, which prevents the balloon from melting and popping. |
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What You'll Learn
The science behind the balloon and candle experiment
Water has a significantly higher heat capacity than air. This means that it requires substantially more energy to raise the temperature of water compared to air. As a result, when a balloon filled with water and air is subjected to a candle flame, the water acts as a heat sink, absorbing and dissipating the heat away from the latex. This protective mechanism prevents the latex from melting and allows the balloon to withstand the flame without bursting.
The water inside the balloon gradually heats up over time. Eventually, the water reaches a temperature where it can no longer effectively cool the latex, leading to the balloon eventually bursting. However, the time it takes for this to occur is notably longer than in a balloon filled solely with air.
The presence of a black or sooty spot on the balloon's surface, where the flame came into contact with the latex, is also noteworthy. This discolouration is not due to the balloon burning but is caused by carbon deposits left behind as the flame burned oxygen and released carbon dioxide. This observation further underscores the unique interaction between the flame, water, and the balloon's material during the experiment.
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How to make a balloon unpoppable
A balloon will pop when it gets too close to a flame as the heat from the candle weakens the balloon's skin. To make a balloon unpoppable, you can try the following methods:
Using Water
The heat from the flame heats the water instead of the balloon, which then doesn't burst. Blow up a balloon and slowly lower it over a lit candle. The balloon will pop. For the second balloon, add about 200ml of cold water, and blow it up to the same size as the first one. Lower the balloon over the candle again, and this time, the balloon should be able to touch the flame without popping.
Using Drawing Pins
Scatter a handful of drawing pins evenly over a flat surface, pointing upwards. Push an inflated balloon down onto the bed of pins. Surprisingly, the balloon won't pop! This is because when the balloon is pressed down over many small points, the pressure is spread between each pin. Therefore, you need to push down harder before any one pin has the force to pierce the taut rubber.
Using a Skewer
Hold the balloon gently and push a skewer slowly and firmly into the "button" of thick rubber at the top. The balloon will deform, and the skewer will eventually work its way through. Pull the skewer out, and the holes will seal, allowing the balloon to remain inflated.
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How to make a candle-powered hot air balloon
Building a candle-powered hot air balloon is a fun project, and it's easier than you might think. Here's a step-by-step guide on how to make one:
Materials and Preparation:
Firstly, gather your materials. You will need painter's plastic, balsa wood, birthday candles, tape, a hot knife or a heated fork, and a large sheet of cardboard. The painter's plastic should be thin (1/2 mil or 12 microns) for effective flight. A large sheet of cardboard will be useful for layout and catching hot wax.
Cutting and Sealing the Plastic:
Pull out about six feet of the painter's plastic and cut it to form a 9 x 6-foot sheet. Fold this sheet in half along the 9-foot side, creating a two-ply sheet measuring 4.5 x 6 feet. Now, use your hot knife or heated fork to heat-seal the two 4.5-foot edges, ensuring they are properly sealed.
Assembling the Frame:
Assemble the balsa frame by forming an "H" shape. Use a 36-inch piece of balsa for the vertical stroke and two 3/16 x 1/8 x 30-inch balsa sticks for the horizontal parts. Secure the joints with small pieces of clear tape.
Attaching the Balloon and Candles:
Tape a balloon to the balsa frame. You can use a stick inside the balloon to hold the plastic away from the candles. Attach the candles to the balsa wood by melting their bottoms with a hot knife or heated fork. Ensure you use enough candles to match the size and weight of your balloon.
Inflation and Flight:
Light the candles and use the stick to hold the plastic up, allowing hot air to fill the balloon. Once it's inflated, your hot air balloon will start to lift off. You can attach a string to control its flight or let it fly freely until the candles burn out. Be cautious, as there is a risk of fire, especially with nearby trees, curtains, or dry grass.
Building a candle-powered hot air balloon requires careful planning and attention to safety. Always think through the potential risks and take precautions to ensure a safe and enjoyable flight experience.
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How to blow out a candle from a distance with a balloon
Blowing out a candle from a distance with a balloon is a fun experiment that can be done at home. It involves using a balloon to create a shockwave of air that will extinguish the candle. Here is a step-by-step guide on how to do it:
Materials:
- A balloon
- A cup or container (optional)
- Scissors
- A candle
- Matches or a lighter
- Water (optional)
Instructions:
Firstly, cut about one-third of the bottom of the balloon. You may need to adjust the cut so that the balloon fits snugly across the mouth of the cup. This step is optional, but using a cup can help direct the airflow and make the experiment easier.
Next, blow up the balloon to a decent size, ensuring there is some air pressure inside. Be careful not to overinflate the balloon as the latex can stretch too thin and pop. Once the balloon is filled with air, tie the mouth into a knot, leaving a long tail if you wish to tie a piece of string to it for ease of pulling.
Now, stretch the cut end of the balloon across the mouth of the cup, with the knotted end sticking out. If you are not using a cup, simply tie a knot at the end of the balloon and proceed to the next step.
Place the candle on a flat surface and light it. Stand about one foot away from the candle and use the knotted end of the balloon to create tension. Aim the balloon at the candle and release it, allowing a blast of air to rush out and extinguish the flame.
Tips and Variations:
- Adding water to the balloon: If you want to try a variation of this experiment, you can add water to the balloon before inflating it. Water has a higher heat capacity than air, so it absorbs heat from the flame, preventing the balloon from popping. However, eventually, the water will heat up, and the balloon will pop.
- Distance and force: Try experimenting with different distances and observe the effect on the candle. You can also try pulling the knotted balloon tip with varying force to create different shock waves.
- Safety first: Remember to wear safety goggles and have adult supervision when conducting these experiments, especially when working with flames and balloons that can pop.
With these simple steps and variations, you can enjoy exploring the science behind this fascinating balloon and candle experiment!
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How much water is needed to stop a balloon from popping?
Blowing out a candle with a balloon is a fun science experiment. A balloon filled with air will pop when it gets too close to a flame as the heat from the candle warms and weakens the balloon's skin. The trick to making an unpoppable balloon is to add water to it. The heat from the flame heats the water instead of the balloon, which then doesn't burst. Water has a high heat capacity, meaning it takes a lot of heat and energy to change the temperature of water. This is due to the strong physical bonds of water molecules.
Now, how much water is needed to stop a balloon from popping? The amount of water required depends on various factors, including the size of the balloon, the temperature of the water, and the intensity of the heat source. In one experiment, adding 60 ml of water to a balloon was sufficient to prevent it from popping when exposed to a candle flame. In another experiment, 200 ml of water was used, and the balloon did not pop when touched by the flame.
It's important to note that while adding water can significantly increase the balloon's resistance to popping, it is not guaranteed to make it completely pop-proof. The effectiveness of this method depends on several variables. Firstly, the size of the balloon matters. A larger balloon has more surface area in contact with the heat source, which can increase the chances of it popping. Secondly, the temperature of the water plays a role. If the water is already warm or hot, it will have less capacity to absorb heat from the flame, potentially causing the balloon to pop sooner. Finally, the intensity of the heat source is a critical factor. A stronger heat source, such as a blowtorch, can generate more heat energy than a typical candle flame, increasing the likelihood of the balloon popping.
To optimize the chances of success, it is recommended to use a small to medium-sized balloon, fill it with cold water, and ensure that the heat source is not extremely intense. By following these guidelines, you can minimize the risk of the balloon popping and safely enjoy the fascinating science behind this experiment. Additionally, adult supervision and safety goggles are advised when conducting this experiment to ensure a safe and enjoyable experience.
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Frequently asked questions
To blow out a candle with a balloon, first, blow up the balloon with air. Slowly lower the balloon towards the flame of the candle. The heat from the candle will melt the balloon until it bursts, creating a blast of air that will extinguish the candle.
The heat from the candle flame warms the balloon's skin and weakens it. The latex of the balloon melts and eventually bursts due to the pressure of the air inside.
Add water to the balloon before blowing it up. Water has a higher heat capacity than air, meaning it takes more energy to heat it up. The water absorbs the heat from the flame, preventing the latex of the balloon from melting.
