Brooke Martin
The candle test is a simple way to test the efficacy of a face mask. If you can blow out a candle while wearing a face mask, it means that your mask doesn't adequately stop the flow of air, and therefore may not be effective at preventing the spread of COVID-19. While the test is far from foolproof, it can be a good indicator of whether your mask is clearly ineffective.
| Characteristics | Values |
|---|---|
| N95 mask | Passes the candle test |
| Surgical mask | Passes the candle test |
| Cloth mask | Fails the candle test |
| Loose scarf | Fails the candle test |
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What You'll Learn
The N95 mask passes the candle test
The N95 mask is a type of personal protective equipment (PPE) that has gained prominence during the COVID-19 pandemic. It is designed to provide a high level of protection against airborne particles and respiratory secretions. To test the effectiveness of masks, a simple method that emerged on social media is the "blow out the candle" test. This test involves trying to blow out a candle while wearing a mask, and if the candle remains lit, it indicates that the mask is effective at blocking airflow and potentially viral particles.
The N95 mask's ability to pass the candle test highlights its effectiveness in blocking airflow and potentially reducing the spread of viral particles. This is particularly important in high-risk situations, such as during the COVID-19 pandemic or in healthcare settings. N95 masks are designed to filter out at least 95% of small and large airborne particles, providing a higher level of protection compared to other types of disposable masks like KN95s and KF94s.
While the N95 mask passes the candle test, it is important to consider other factors that can affect its effectiveness over time. N95 masks do have expiration dates, and while age alone is not the sole determining factor, the condition of the mask is crucial. A well-kept N95 mask with intact straps, a functional filter, and a tight fit can remain effective even years after its expiration date. However, it is recommended to check the mask's condition regularly and replace it if necessary.
In conclusion, the N95 mask passing the candle test demonstrates its ability to block airflow and potentially reduce the spread of respiratory droplets. This knowledge, combined with insights from studies and experts, reinforces the importance of wearing N95 masks in high-risk situations to protect against illnesses like COVID-19. However, it is essential to consider the mask's condition and fit, as well as stay informed about expiration dates, to ensure optimal protection.
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Cloth masks fail the candle test
The candle test is a simple way to check the efficacy of a face mask. If one can blow out a candle while wearing a mask, it means that too much air is passing through, and the mask is not doing its job. While the test is not foolproof, it can help identify a mask that is clearly ineffective.
Cloth masks are non-medical devices, but they can be designed to offer reasonable protection. However, they often fail the candle test. ABC7 News Anchor Kristen Sze, for instance, was able to blow out a candle while wearing a cloth mask. Similarly, science communicator Bill Nye tested a variety of common mask options, and almost all passed the candle test, except for a loose scarf.
The candle test does not provide an exact measure of a mask's effectiveness, but it can indicate a definite failure. Cloth masks can be designed to offer better protection by increasing the number of layers, using a fine weave, high thread count, and dense material. Masks made of pure cotton, for instance, are not ideal as the outer layer because they are absorbent. Instead, a polyester or cotton-polyester blend is recommended for the outer layer.
In addition to the candle test, other simple methods can be used to assess the effectiveness of cloth masks. One such method is the water drop test, which involves checking if a drop of water on the outer surface of the mask is absorbed. If the drop is absorbed, the mask fails the test, but if it forms a bead, the mask is water-resistant.
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The candle test is not foolproof
The "blow out the candle" test has emerged on social media as a way to test the efficacy of face masks. The test involves putting on a mask and attempting to blow out a candle. If the candle goes out, it means that too much air is passing through the mask, potentially allowing COVID particles to escape and infect others.
While the candle test is a simple way to determine whether a mask is clearly inadequate, it is not foolproof. For one, the test does not account for the fit of the mask. If a mask is loose-fitting, it may allow air to leak in and out, even if the material itself is effective at blocking particles. To address this issue, some people recommend wearing a nylon stocking over the mask to improve the fit and seal.
Additionally, the candle test does not provide a precise measure of a mask's effectiveness. As Harvard Medical School physician Dr. Abraar Karan notes, "Being able to blow a candle out may be some measure of how well particles can exit your mask, [but it's] unclear to me how reliable that is as a proxy for small aerosols exiting with normal speaking or coughing." Similarly, Dr. Amy Price, a senior research scientist at Stanford's Anesthesia Informatics and Media Lab, states that while the candle test is a good rule of thumb, it won't give you an exact measure of a mask's efficacy.
Furthermore, the candle test does not take into account the directionality of airflow. A mask that fails the candle test may still provide some protection by reducing the distance that respiratory droplets can travel. Masks are designed to limit the spread of droplets, rather than completely trapping the virus. Even if a mask allows some air to pass through, it can still help to reduce the risk of infection by blocking respiratory droplets from travelling long distances.
In conclusion, while the candle test can be a useful indicator of a mask's effectiveness, it is not a perfect measure of its protective capabilities. To fully assess a mask's efficacy, it is important to consider factors such as material, thread count, fit, and water resistance.
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The science behind the test
The science behind the candle test is based on the idea that if a person wearing a mask can blow out a candle, it means that the mask does not adequately stop the flow of air. This implies that the mask may not effectively prevent the spread of respiratory droplets containing viral particles, such as COVID-19 particles.
The test itself is straightforward: a person wears a mask and attempts to blow out a candle. If the candle remains lit, it suggests that the mask is relatively effective at blocking airflow and potentially offers better protection against the spread of respiratory droplets. On the other hand, if the candle is blown out, it indicates that the mask may not be providing sufficient protection.
The candle test gained popularity during the COVID-19 pandemic as a simple, at-home method to assess the effectiveness of different types of masks. It was popularized by celebrity science communicator Bill Nye, who demonstrated the test on TikTok. In his videos, Nye showed that a certified N95 mask could not blow out a candle, illustrating the mask's ability to block airflow and potentially trap respiratory droplets.
While the candle test provides a basic indication of a mask's effectiveness, it is not a perfect measure of its protective capabilities. Dr. Amy Price, a senior research scientist at Stanford's Anesthesia Informatics and Media Lab, notes that the test is a good rule of thumb but may not provide an exact measure of a mask's efficacy. Similarly, Dr. Abraar Karan from Harvard Medical School expresses similar sentiments, questioning the reliability of the candle test in representing the behaviour of small aerosols during normal speaking or coughing.
In conclusion, the candle test is a simple way to assess the airflow blockage provided by a mask. While it does not provide a definitive measure of a mask's effectiveness, it can help identify masks that may not offer sufficient protection against the spread of respiratory droplets.
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Other ways to test mask efficacy
The candle test is a simple way to test the efficacy of a mask. If you can blow out a candle while wearing a mask, it means that too much air is passing through, and this could potentially expel COVID viral particles. While this test is not foolproof, it can help identify a mask that is clearly ineffective.
Bacterial Filtration Efficiency (BFE)
The BFE test measures how effectively a mask filters bacteria-containing droplets of about 3 microns in size. The higher the BFE, the more effective a mask is in preventing bacteria-containing droplets from reaching the wearer.
Viral Filtration Efficiency (VFE)
The VFE test is similar to the BFE test but uses a different challenge organism (bacteriophage instead of bacteria). The higher the VFE, the more effective a mask is as a barrier against viruses, including coronaviruses. A mask with a VFE of 95% blocks 95% of virus-containing droplets it is exposed to.
Filtration Efficiency
This test measures the percentage of particles of a certain size that a mask keeps out. N95 masks, for example, should filter out at least 95% of particles of a certain size.
Liquid Penetration
This test simulates blood spatter and assesses whether it can soak through the mask. The inward-facing side of the mask is visually inspected, and a swab is used to check for any liquid penetration.
Particle Measurement
This method involves directly or indirectly measuring the amount of respiratory particles of differing sizes, or measuring the amount of infectious particles.
Source Control
This approach involves having someone wearing a mask vocalize by breathing, talking, or coughing, to test the mask's ability to contain particles.
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Frequently asked questions
The candle test is a simple way to gauge the effectiveness of your face mask. If you can blow out a candle while wearing a mask, it means that too much air is passing through, and your mask is ineffective.
Put on your mask, light a candle, and try to blow out the flame. If the candle goes out, your mask is not blocking the flow of air.
Yes, N95 masks pass the candle test. Science educator Bill Nye demonstrated this in a TikTok video, where he tried and failed to blow out a candle while wearing an N95 mask. ABC7 News Anchor Kristen Sze also passed the candle test while wearing an N95 mask.
Surgical masks pass the candle test. Both Bill Nye and Kristen Sze were unable to blow out a candle while wearing a surgical mask.
It is unclear whether Athleta masks pass the candle test. However, cloth masks generally fail the candle test, and Athleta masks are made of fabric.
