In one sentence, describe what the following article is about: After you are sure everything has been securely connected, use the switch device on your vacuum pump to turn it on. You should be able to hear the vacuum running once it is switched on. If you are trying to start the pump in cold weather, open the intake ports until the pump reaches normal running speed. Then, close it off again. Once your vacuum is on, you will need to open the gauge valves, located on the side of each gauge. This allows the vacuum to start pulling air out of the system. If you are unsure which way you need to turn your valves to open them, check the manual that came with your gauges or vacuum. Let your vacuum run at full operating speed for at least 15 minutes and up to 30 to completely pull the air out of your AC system. The exact amount of time you will need to let your vacuum run will vary based on your manufacturer's recommendations, so check any operational manuals you may have for both your AC system and vacuum pump. Generally, you want to let your vacuum run for at least long enough to get the measurement below 1,000 microns. If you can, try to get it down to 500 microns.
Summary: Start your pump. Open the side gauge valve. Allow the vacuum to run for 15-30 minutes.

In one sentence, describe what the following article is about: When you have dry skin on your face, it feels dry and perhaps even stiff when you move your face's muscles quickly or try stretching your face. Your dry facial skin may look flakey or like it needs to peel on occasion. Your dry skin might form cracks that bleed. It may also look noticeably like it needs hydration or moisturizing. Many people get more severe dry skin in the winter because of the climate change. The surface of your skin may also appear dull and you may have visible fine lines if your skin is dry. Immediately after you wash your face, oily skin won't stay matte for long. It gets shiny again very quickly. Your face will shine because of the oil produced on the surface of your skin, and your pores will be easily visible across the center of your face. There will likely be many breakouts on your face if you have oily skin. Oily skin is more common in younger people. Skin typically gets more dried out as we age. If your face is oily in the T-zone (the area of your nose, between your eyes and eyebrows, and forehead only) but everywhere else is dry, you probably have combination-type skin. If you have combination skin, then you will need to moisturize the different areas of your face appropriately. Follow guidelines for oily skin for your T-zone and follow guidelines for dry skin for the rest of your face. Combination skin usually involves pores that look larger than normal because they are more open. This can also lead to more frequent breakouts.
Summary: Notice the symptoms of dry skin. Recognize if you have oily skin. Determine if you have a combination skin type.

In one sentence, describe what the following article is about: Sometimes the dentist is able to reattach the portion of tooth that broke off, so you should save it if you can. Take the shard and put it in a container with milk or saliva to keep it from rotting. Then bring it with you when you visit the dentist. You should never try to reattach the portion of tooth yourself. Not only will this not work without proper equipment, but you'll cause severe pain for yourself if you poke an exposed nerve. Your mouth is full of bacteria, and any injuries can get infected easily. To help stave off infection, rinse your mouth with a salt water solution when you know you've broken a tooth. Mix 1 tsp of salt into 1 cup of warm water. Swish the mixture around your mouth for 30 to 60 seconds.Concentrate on the injured area. Be sure not to swallow any of the mixture. Repeat this rinse after meals. If you've damaged your tooth badly, the pain can be severe. You can treat it with OTC pain relievers until you go to the dentist and get it fixed. Ibuprofen products like Motrin and Advil are usually preferred over acetaminophen because ibuprofen also reduces swelling in addition to treating pain. But if ibuprofen isn't available, take an acetaminophen product like Tylenol. Sometimes a chip in the tooth will produce a jagged edge that could cut your tongue or gums. To prevent damage to your mouth, cover the edge with dental wax. You an purchase this in the oral care aisle of most pharmacies. Alternatively, you could also cover the edge with a piece of sugar-free chewing gum. It's possible that you won't be able to see your dentist for several days after you crack your tooth. In this case, you'll have to eat before your appointment. Take the following measures to reduce pain and prevent further damage when eating. Stick with soft foods. The cracked tooth is weakened and susceptible to further damage. Hard foods could make the crack worse and cause pain. Opt for soft foods like pudding, soup, and oatmeal until your doctor performs the necessary work. Don't eat anything especially hot or cold. The cracked tooth will be sensitive to extreme temperatures, and very cold or hot foods can cause pain. Serve food at room temperature to avoid any problems. Try to eat on the unaffected side of your mouth. Any chewing can cause pain and further damage, so if possible you should avoid chewing with the cracked tooth.
Summary:
Save the shard of tooth if you have it. Rinse your mouth with salt water. Take over the counter pain relievers to help with the pain. Cover sharp edges with dental wax. Be careful when eating until you see your dentist.