The pump we used to inflate the basketball was a common hand pump. average air pressure at sea level is 1.03 kilograms per square centimeter (kg/cm2) or 14.7 pounds per square inch (psi); What happened? Air Pressure Gauge (optional) If your air pump does not have an air pressure gauge, you may want to get a separate air pressure gauge to check the pressure in your ball. These factors will determine How many pounds per square inch (PSI) you can inflate a basketball before it fails. The first mercurial barometer, invented in 1643, consisted of an overturned glass tube containing mercury. To avoid erroneous measurements, the pressure sensor is exposed via a static pressure head ( see image above ), a device designed in such a way that the dynamical effects of wind are minimised. The basic principle is that when more air is pushed into the ball, the air pressure increases because the air is being squished, trying to fit in a minimal space. The volume was calculated using the circumference of the ball at each pressure, accounting for thickness of the skin of the ball. Among them are pounds per square inch, millimeters of mercury, atmospheres, and pascals. When the basketball reads the correct pressure, measure one meter from the floor because this will be the height that you drop the ball from. Atm (Atmospheric Pressure) Conversion: An atmosphere (atm) equals to the air pressure at the sea level at a temperature of 15 Celsius. Insert the plug and the let the ball sit for another day. As air pressure goes up, the level of mercury rises inside the tube. The magnitude of the pressure force is equal to the pressure (force/area) times the surface area, and the direction is perpendicular to the surface. The result might be 0.1 gram or so, depending on the size of the can and how tightly packed it was. Fill up basketball to 9 PSI (62.06 kPa) using pressure gauge and air pump system 4. Tape measuring tape to wall/ ledge such that 0 m is at the ground and 4 m is at the holder position 5. Align ball at 1 m 6. Set camera to record and drop ball from height to measure and record rebound height 7. A quick way to check if your ball has the proper air pressure is by taking this simple test. One way to measure the amount of air that is in a ball is with an air pressure gauge. We disassembled the pump to measure the inside diameter of the cylinder, d = 3.4 cm, and reassembled it to measure the length of its stroke, Δz = 38 cm. When a basketball is inflated, it is being inserted with lots of air, similar to that of a balloon. Spalding makes the game balls for the NBA and uses a rubber bladder wrapped in fiber with a leather outer casing (this is the part you see), and has a 29.5 in circumference. Once the ball is fully filled up with air, press the plug back into the hole to stop the air from escaping your ball. If it bounces up back to the height of your hips, then your ball probably has the … Read the pressure level on the gauge of your hand pump. Regulating a basketball's air pressure ensures fair playing conditions throughout a league. Start by using an air pump with a pressure gauge to check the air pressure of the basketball. The ball used in a game should have high air pressure, which is explained through the law of physics. html). There are various measurements used for air pressure. A: Great question. You will use an air pump, a basketball, and an air pressure gauge to test if changing the air pressure will change the bounciness of the ball. Conventional wisdom is that a … Sit your ball … Set a chair next to the wall beside the measuring tape. In fact, the force of air pressure is so great that you can even use it to crush a can. Light also has weight, but very very little. Conventional wisdom is that a basketball needs 8 psi to be properly inflated. The U tube is filled with water and the height difference is measured. Three Hang the measuring tape on a wall next to an open area where a ball can be bounced. As air pressure increased, the pressure would force more mercury in the tube. An instrument that measures air pressure is called a barometer. While this experiment was conducted to only measure the effect of air pressure on the COR of a basketball at 1 m, it could be extended to include more heights, creating a more complete data set of the COR of a basketball under different conditions. According to NBA rules, the pressure inside a basketball must be between 7.5 and 8.5 lbs. The tube is filled with mercury. P = F A P = F A. NBA rules dictate that basketballs should be inflated to between 7.5 and 8.5 pounds per square inch. For the initial trial, the ball will need to have a pressure of 4 pounds per square inch. The gauge pressure is what we measure above the normal atmospheric pressure we experience all the time, and never notice. The SI unit for pressure is the pascal, where. Pressure is defined as the force divided by the area perpendicular to the force over which the force is applied, or. 1 Pa= 1N/m2 1 Pa = 1 N/m 2. The pressure that must be used is the total pressure. A given force can have a significantly different effect depending on the area over which the force is exerted, as shown in Figure 1. The original instrument had mercury in the small basin, with an upside down glass tube placed in the mercury. The next hack involves using an air compressor to blow up your basketball. As air passes through the dust layer and the filter medium, it loses the dynamic or velocity component of pressure. Change pressure accordingly to what pressures you want to measure. One of the first barometers was developed in the 1600s. (The first barometer of this type was devised by Italian physicist and mathematician Evangelista Torricelli in 1643.) Check pressure then release to get it to where you want it. Enlist the help of volunteer to help you mark how high the ball bounces. In the United States, we measure this force using psi, or pounds per square inch. This glass tube sits upside down in a container, called the reservoir, which also contains mercury. Compare your result with your target pressure level, and inflate or deflate your ball accordingly. Air pressure. Air pressure is the weight of air molecules pressing down on the Earth. We conducted our experiment inside, using the … Eventually, as dust builds up on the bags, there is greater resistance to air flow and the volumetric flow rate decreases. pressure This manometer is used to measure the pressure in the supply of heating gas to a building. If you weigh a vacuum-packed can of nuts (with most of the air removed) then open it so the air can rush in, you can weigh the air that went in. The recommended air pressure in a basketball is between 7 and 9 pounds per square inch (psi). Get your basketball and measure the air pressure inside of it using the pressure gauge. The most frequently used pressure units. It is recommended that you use one of these gauge to measure the exact amount of pressure in a ball after inflating and before use. Get your basketball and measure the air pressure inside of it using the pressure gauge. Change pressure accordingly to what pressures you want to measure. When the basketball reads the correct pressure, measure one meter from the floor because this will be the height that you drop the ball from. Another simple test is to drop the ball from shoulder height. It should bounce to a height approximately even with your hips. You'll need a pump or compressor to fill football, basketball etc. That pressure is called atmospheric pressure, or air pressure.It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Measuring air pressure on island of Hawaii. When dropped from a height of 6 feet, a properly inflated basketball should bounce upward between 52 and 56 inches (http://www.bestsoccerbuys.com/balls-basketball. The most frequently used units of pressure are pascal (Pa), kilopascal (kPa), megapascal (MPa), psi (pound per square inch), torr (mmHg), atm (atmospheric pressure) and bar.

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