Article: Another method to measure the acidity of a solution is to use a pH meter. This is a specialized piece of laboratory equipment that is expensive and you may not have access to one. If you do have one available, you can use it to determine the exact pH of a solution. For this experiment, you will need: Rainwater A pH meter Calibration buffers (one with pH 7.0 and one with pH 2.0) During a rainstorm, place a clean container outside at a height of at least two meters (six-and-a-half feet). Placing the bucket up high prevents dust and dirt from getting into the rainwater. These contaminants can affect the pH of the water. Collect at least one cup (250 mL) of rainwater for measurement. Before using a pH meter, it must be calibrated so that it gives you the correct reading of your sample. Each meter is different but the general calibration process is the same. First, rinse the electrode of the meter with water and then place it into a buffer with a known pH of 7.0. Set the readout display to 7.0 so the meter knows that this is what a neutral pH is. Repeat this process with another buffer that is acidic (around pH 2.0). Some meters may also require that you calibrate with a buffer that is also basic (around pH 10.0). Always rinse the electrode between solutions. Rinse the electrode with distilled water before use. After calibration, you can place the electrode in the rainwater. Once the reading has stabilized on the meter, the display is the pH of the rain. Remember, normal rain has a pH between 5.0 and 5.5. Acid rain is usually in the range of 4.0-4.4.
Question: What is a summary of what this article is about?
Gather the necessary materials. Collect some rainwater. Calibrate the pH meter. Measure the acidity of rainwater.
Article: Before forming a dance routine, spend some time learning a few basic moves. The dance move "the strike" is a fun dance move that can help with any routine. Here's how to do it: Stand with your feet hip width apart, toes straight ahead. Hold your arms in front of your chest, right over left, with your hands forming fists. Hop on your right foot while bending and turning your left heel on the floor. Bend both arms 90 degrees. Turn your right hand to the ceiling, palm facing forward. At the same time, turn your left arm away from you, palm facing down. Hop again and return your feet and arms to their original positions. Repeat the process of bending and turning again, this time leading with your left foot. Happy feet is a simple move that will help you get into the rhythm of a dance routine. This can be a fun, foundational move for any dance routine. Here's how you do it: Stand with your feet together and your arms bent to the chest level. Grasp your left wrist with your right hand. Step your right foot to the side and lean into it while letting go of your wrist. Pull your elbows behind your body, keeping them level with your shoulder. Bend them at a 90-degree angle. Return your feet to the original position. Step your left foot out while raising your arms above your head back to starting position. Repeat the process, alternating your left and right sides. The hopscotch is a fun, active dance move. Learning it can help you form your own dance routine. Here's what to do: Stand with your feet together. Bend both arms in towards your body. Cross your right foot in front of your left foot while pulling your arms to the right. Cross your right foot behind your left foot and swing your arms to the left. Bring your feet together and hop 3 times in a small circle. Repeat the process using your left foot instead. The slap can be a fun, energetic dance move to add to a routine. Spend some time practicing this move when forming your own dance routine. This is how you do it: Stand with your legs about 2 feet (61cm) apart. Hop on your left foot while bringing your right knee up to your hip. Brush the top of your right knee with your left hand. Think of this like brushing some dirt off of your knees. Return to the original position. Repeat the process with your left knee and right hand. The two-step is a very basic dance move that can help you get into the rhythm of the music. Practicing the two-step can help you form a dance routine. This is what you need to do: Move your right foot to the right, then move your left foot to meet it. Repeat the process with your left foot. Keep in time to the music. If you want to add a little something to the move, reach forward with your heel while leaning back slightly. People are often confused as to how to move their arms when dancing. There are a variety of basic dance move options regarding moving your arms. Move 1 arm up and the other arm down. You can snap your fingers as you move your arms, if you want. Try the shoulder roll. This is simply rolling 1 shoulder at a time, moving with the beat of the music. There are a very large amount of dance moves and styles. If you're interested in forming a dance routine, explore. Take a dance class or two. Watch people at a club or look up music videos online. Have fun and be creative. Your dance routine should be an expression of your personal taste and style.
Question: What is a summary of what this article is about?
Learn the strike. Practice happy feet. Do the hopscotch. Try the slap. Practice the two-step. Figure out what to do with your arms. Explore other moves.