How does the vacuum candle experiment work?
The candle burns dimly for a short time until the oxygen is gone. When the flame goes out, the air in the flask quickly cools and contracts (takes up less space). The cooling, contracting air creates a vacuum (a lower pressure) in the flask.
What happens to a candle in a vacuum?
When the flame is out, the air starts to cool and that means it’s shrinking again. That produces a partial vacuum – the area of low pressure. The pressure outside of the glass (atmospheric pressure) is now higher than that in the glass. So water inside the glass quickly rises to make up the difference.
Why does a candle stop burning when placed in vacuum?
All the oxygen gets converted into carbon dioxide. Carbon dioxide does not support burning and hence candles stop burning. Was this answer helpful?
What does the candle experiment show?
The physical aspect: the candle heats the air and expands it. This cancels the depletion of the oxygen temporarily and the water level stays down. When the oxygen is depleted, the candle goes out and the air cools. The volume of the air decreases and the water rises.
How do you explain a vacuum to a child?
A vacuum is a space with nothing in it—not even air. There is no such thing as a total vacuum because it is impossible to remove all the air or particles from a space.
How does a candle create a vacuum?
The flame from the candle quickly heats up the air in the glass. The hot air expands, forcing part of it out, underneath the edge of the glass. When the flame goes out, the air abruptly cools again, and contracts. That contraction creates a vacuum, lower pressure inside the glass and higher pressure outside.
What keeps the candle burning experiment?
Fire is a chemical reaction that creates light and heat from oxygen and fuel. A lit candle needs to draw oxygen from the air in order to continue burning. If you limit the amount of air available, the candle’s flame eventually goes out once it uses up all the oxygen.
What does the experiment conclude?
Correct Answer:
Your conclusions summarize how your results support or contradict your original hypothesis: Summarize your science fair project results in a few sentences and use this summary to support your conclusion. Include key facts from your background research to help explain your results as needed.
Why do candles suck water?
The explanation goes like this: The candle heats the air and the air expands. Some of this expanding air escapes the container and leaves through the water (probably making bubbles). After the fire goes out, the air cools and the volume decreases causing the water to rise in the container.
How do you make a vacuum for a science project?
Creating a Vacuum Science Experiment
- Fill a glass or jar with water.
- Add a few drops of food coloring to give the watercolor.
- Carefully place and light a candle in the center of a dish or plate.
- Pour the colored water around the candle.
- Set an empty, clear glass over the top of the candle.
What is the principle of vacuum?
To attain a state of vacuum, a space must be empty, i.e. devoid of all gaseous material. The consequence of this is that the pressure in this space is very low, as it contains no or only a small number of particles, which exert a force on an area as a result of their impact against the walls.
Can a candle create a vacuum?
Can a candle burn without air?
Which candle will extinguish first?
The shortest candle will go out first because carbon dioxide is more dense than air and will settle at the bottom and put out the flame.
How do you summarize the results of an experiment?
Just say what you did, as clearly as possible.
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In Practice
- Include an overview of the topic in question, including relevant literature.
- Explain what your experiment might contribute to past findings.
- Keep the introduction brief.
- Avoid giving away the detailed technique and data you gathered in your experiment.
What is the main goal of an experiment?
The goal of the experiment is to measure the response to the stimulus by a test method. In the design of experiments, two or more “treatments” are applied to estimate the difference between the mean responses for the treatments.
What gas law is the candle experiment?
The candle warms the air, and this increases the air volume inside the glass. When the candle burns out (because all the oxygen is used up), the temperature cools quickly. This temperature decrease means the volume also decreases, which lets the water rise to fill up that space. This is called Charles’s Law.
How do you do the water and candle experiment?
Method
- Put a very little water on a plate, and mix in a couple of drops of food colour.
- Place a candle in the middle of the plate, and light it. Slowly bring a glass down on top of the candle until it is standing in the water, on the plate.
- Watch what happens next!
Does vacuum increase pressure?
For a given volume, and temperature, P is directly proportional to n. When you create a vacuum, the vacuum pump removes a large amount of the gas from the container, so the pressure of the gas falls to a very low value.
What happens in a vacuum physics?
vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).
Why does water get sucked up glass with candle?
Can a candle burn in space?
Candle flames behave differently in outer space (microgravity) than they do on earth, primarily because microgravity provides an environment that lacks buoyant convection, which normally plays an important role in maintaining and shaping a flame on earth.
Would a candle work without gravity?
A flame is simply hot gas, heated by the oxidation of its fuel. Being hot, it expands and is therefore of a lesser density than the air around it, forcing it upwards in an environment with gravity. In zero gravity there would be no such upward movement.
Which candle burned the longest time why?
The first step is understanding the wax. This is where soy reigns supreme. Paraffin wax tends to be cheaper, and burns at a much faster rate than soy wax. In comparing two candles of the same size, a paraffin candle will usually have a lifespan of 35 to 40 hours whereas a soy candle can burn for 50 to nearly 80 hours.
How do you write an introduction for an experiment?
Introduction or Purpose
In one sentence, state the hypothesis. Sometimes an introduction may contain background information, briefly summarize how the experiment was performed, state the findings of the experiment, and list the conclusions of the investigation.