If you are working on some science projects and you need to purchase some test tubes, then you may find yourself trying to decide whether to buy plastic test tubes or glass test tubes. If this particular situation applies to you, then you should know that glass test tubes are superior to plastic test tubes for a number of reasons. So, when in doubt, you should use glass test tubes instead of plastic test tubes. Today, I will discuss three reasons why plastic test tubes are inferior to glass test tubes so that you will have a better understanding.

Plastic Test Tubes Are Not Reusable

One of the biggest disadvantages of using plastic test tubes instead of glass test tubes is the fact that plastic test tubes are not designed to be used over and over again. The vast majority of them are disposable and should be discarded immediately after use. A lot of this has to do with the fact that plastic test tubes are very difficult to clean, as some chemicals may leach into the pores of the plastic. Glass test tubes, on the other hand, are reusable and they are relatively easy to clean. While you may save some money initially by purchasing plastic test tubes instead of glass test tubes, you will end up spending more money over time.

Plastic Test Tubes Cannot Handle Corrosive Substances

You should also be aware that plastic test tubes are not designed to handle corrosive substances. Some of the substances may end up destroying the plastic. Plastic test tubes are generally designed for accommodating aqueous and non-corrosive solutions only. With glass test tubes, you don’t have to worry about this issue, as they can accommodate just about any substance that you can think of. So, if you’re not sure as to what substances you’re going to be using the test tubes for, then you should definitely purchase glass test tubes.

Plastic Test Tubes Can’t Handle High Temperatures

If you’re going to be using these test tubes and high temperature applications, such as when working with Bunsen burners or autoclaves, then you should definitely purchase glass test tubes instead of plastic tubes. This is because plastic test tubes will melt at certain temperatures. Glass, on the other hand, has a much higher melting point, so it can withstand much higher temperatures the plastic.

The inability to handle high temperatures, the inability to accommodate corrosive substances, and one-time usage are just three reasons why plastic test tubes are inferior to their glass counterparts.


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Bio Oil and Mederma are among the brands that people use for treating skin problems like scars and stretch marks. There has always been lingering questions about which of these two leading skin care products is more effective in lightening scars and fading stretch marks. However, clinical studies show that each of the products has its own benefits and drawbacks. Furthermore, both products also provide additional data for their effectiveness and other relevant results. Regarding the effectiveness of each one, the dependent factor will always be the skin type of the person who will use the product.

Bio Oil for Skin Problems:

In today’s day and age, there are numerous products that attempted to be on top of the market for skin care. Bio Oil is one of these products and it has maintained a relatively well-known status in lightening the skin, scars and stretch marks, balancing the skin tone and rejuvenating dry and aging skin. Like many skin care products, Bio Oil contains the essential vitamins A and E due to the fact that they are good for the skin. Aside from these vitamins, the oil also has calendula oil (antioxidant), rosemary oil (moisturizer), lavender oil (conditioning agent and fragrance) and chamomile oil (calming and soothing effect). Also, Bio Oil is non-comedogenic, non-acnegenic and hypoallergenic as per the clinical studies performed on individuals.

If you need more information about Bio Oil and its applications, check out biooilguide.com.

Mederma for Scars:

Mederma skin care has both the cream form as well as the gel form for treating scars. This product is an over the counter medication (OTC) that boasts of clearing old scars. Mederma is recommended for surgical, acne and burn scars as well as stretch marks. Allium cepa, the main component of Mederma, is an onion extract. The OTC product also has aloe vera so as to soften the skin.

Through the website www.mederma.com, you can learn more about Mederma and how it can help in fading scars.

As a summary, bio oil vs mederma cannot wholly be explained without using them and comparing the results. Still, the glaring difference is that Bio Oil has more applications in different skin problems. On the other hand, Mederma focuses on a singular problem but is said to be very effective. As a conclusion, a dermatologist can better provide insight regarding the specific skin issue as well as the best treatment for it.

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The digital e-book reader market is split between the Nook and the Kindle. For lovers of electronic books, they are still interested to know things about other e-book reader models which may even be better. Here are the main points of our ereader comparison.

Price. The Kindle 2 is now available for $189 while the Nook is sold at $199. Both versions are equipped with 3G. There is low cost when it comes to Wi-Fi, but the Nook at close range has limited access to the Internet. If you are looking for a large screen, Kindle DX with a screen size of 9.7″ should be good. In addition, where the prices of the equipment (from 21 June 2010) are concerned, recent market research conducted by WalletPop found out that the Amazon’s Kindle prices are much lower than the Barnes & Noble, and the Sony readers. Finally, it has been said that the Amazon already charges taxes. As for Barnes & Noble, it may levy taxes on all its sites deployed storewide.

Physical characteristics. While both Kindle 2 and Nook have 6-inch screens, Kindle 2 has a slightly larger body. In terms of thickness, the Nook is thinner than Kindle 2. The Nook is also heavier than Kindle. Nook has a color touch screen, but many see this feature unnecessary if compared to the advantage of having longer battery life.

Battery life. You can go up to 2 weeks without charging your Kindle; whereas, the Nook has a battery life of only 7 to 10 days. There are some comments from actual users who say that actual battery life for Kindle is only 10 days, and 4-5 days for the Nook. This can be very particularly true when the battery is used repeatedly over a period of time. Taking a portable e-book reader or wireless battery is even more important, especially for those who travel frequently.

Contents. Barnes & Noble says it has more than one million e-books available. Amazon has 450,000 free ebooks, magazines and newspapers available. Amazon usually has more popular content.

Communication. The latest model of Kindle wireless reading device is now had in connection with global wireless 3G while the version of the Nook has Wi-Fi and 3G. The Kindle uses free 3G Internet and Wi-Fi, but the Nook only has free 3G at Barnes & Noble hotspots.

Special features. Kindle is a popular option because it has the texts of speeches while the Nook does not. Nook can borrow books, and has navigation store which is its decided advantage over the Kindle. The Nook runs on Android, but many people say that those Android applications are slower to execute. E readers reviews are something you must check out.

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The Baratza Maestro, Best Home Use Grinder

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Adidas Barricade 6.0: The Best Tennis Shoes

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The Convenience of Hand Held Vacuum Cleaners

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There are some devices that we can live without, but the vacuum cleaner is not one of them. And for many of us, a portable vacuum cleaner is even more necessary. If you live in a small house, these small devices are a great way to deal with small areas. Depending on the strength of your [...]

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