In one sentence, describe what the following article is about: If your family doctor thinks you have a restrictive lung disease, they will refer you to a respiratory (lung) specialist, also known as a pulmonologist, for further testing. The pulmonologist may conduct a helium dilution test. This inert gas dilution method uses helium to directly identify your residual lung volume. To start the test, you'll exhale normally and then be connected to a closed system containing known volumes of helium and oxygen. Once connected, you breathe in the helium and the amount exhaled is measured. The difference between the two volumes of helium is a pretty accurate estimate of your residual lung volume. Helium is an inert, colorless, odorless, tasteless gas and is non-toxic to your lungs, so there are no health concerns related to this exam. This technique may underestimate residual lung volume because it measures only the lung volume that communicates with the airways. This can be problematic for patients with severe airflow limitation. You will also need a referral to a pulmonologist to have this test done, which measures the air remaining in your conducting airways. To start the test, you'll exhale normally and then be connected to a spirometer that contains 100% oxygen. You'll then breath in deeply and exhale as strongly as you can, and the spirometer will measure the amount of exhaled nitrogen compared to the entire volume of exhaled air. The halfway point of the percentage of exhaled nitrogen allows the doctor to figure out the amount of gas you expelled, which is equal to the residual lung volume. Recall that the air we normally breathe in is about 21% oxygen and 78% nitrogen. This test forces you to breathe 100% oxygen and then measures the amount of nitrogen exhaled, a predetermined percentage of which represents residual lung volume. Like the helium dilution technique, nitrogen washout can also underestimate residual lung volume in patients with severely restricted airflow. This very accurate method for measuring residual lung volume uses a plethysmograph, which is an enclosed instrument (a small chamber you sit in) used for recording an organ's volume change. Once inside an airtight plethysmograph it sort of looks like a small phone booth you'll be asked to normally exhale, then inhale against a closed mouthpiece. As your chest wall expands, the pressure within the plethysmograph rises, which is calculated. Then you'll exhale as hard as you can out through the mouthpiece. The difference in pressures represent your residual lung volume. Body plethysmography uses Boyle's gas law (pressure and volume of a gas have an inverse relationship when temperature is constant) to determine residual lung volume and other lung volumes. Body plethysmography is considered more accurate than gas dilution methods for calculating lung volumes, particularly if the lung is obstructed.
Summary: Get a referral to a medical specialist who can conduct a helium dilution test. Consider the nitrogen washout technique. Have a body plethysmography done for best accuracy.

In one sentence, describe what the following article is about: This will open your options on a drop-down menu. Alternatively, you can click the three-dot icon next to a song or album. It will open the same menu. A list of all your playlists will pop up. This will add the selected song or album to your collaborative playlist. Other users will be able to view, play, or remove these songs on the collaborative playlist.
Summary: Right-click on the song or album you want to add. Hover over Add to Playlist on the menu. Select your collaborative playlist on the list.

In one sentence, describe what the following article is about: You can earn money or gift cards by taking surveys on websites such as swagbucks.com. Other sites, such as Pinecone Research, SurveySpot, and Toluna will also pay you to take surveys. In some cases, you will earn points for taking surveys. Once you have earned a certain number of points, you can then cash them in for money. Join more than one survey site (five or more). You will then receive emails from the survey sites when they select you to take a survey, so be sure to check your email every day. Whether or not a site selects you to take a survey depends on if they need someone from your age group, gender, and race for feedback. Joining more than one site increases your chances of being asked to complete a survey. Before you join a survey site, check to make sure it's legit. Read the privacy policy on the website to be sure that they aren't selling your information to companies. Some survey sites may give you free products instead of money. Other sites may enter you into a sweepstakes instead of giving you cash. If you want cash only, be sure to sign up for sites that reimburse survey takers with money. You can make money by selling a service online (such as creating a logo in photoshop, sending someone a letter, or recording a video). Consider what you enjoy doing and create a "gig" for yourself on this website! If you have a talent for crafts, you can create an Etsy shop and sell your work online. You could make jewelry, cards, bags, and so forth. One thing to keep in mind is the amount of money your materials cost, as well as the time it will take you to complete your craft project. Be sure you are making a profit! You can also sell items on Amazon or eBay. These might be objects you or your parents have but don't need (such as books you have already read). You can also make a lot of money selling vintage items online through these websites. You can often find cool vintage items at yard sales or second-hand stores such as Goodwill. Ask your mom or dad if they have some free time one Saturday to help you hunt for vintage finds in your area.
Summary:
Take surveys. Sell your skills. Get crafty. Sell unwanted items.