You will need
- - spirometer;
- - the balloon;
- - threads;
- - the pelvis;
- - wide plank;
- - measuring Cup.
To determine the amount of light can be in a medical facility. To do this, doctors used a special device – the spirometer.
To measure vital capacity of lungs you will need a balloon, yarn or twine, a large container of water, a wide Board and some measuring utensils. For greater accuracy, it is better to have a graduated beaker. Place the container in the tub and fill with water to the brim.
Take the ball, smooth it between your hands, removing air. This is done for better accuracy of the experiment. However, given that the air in the ball quite a bit and the measurement error will be some fraction of a percent, this stage can be neglected.
Take a maximally deep breath, then firmly press the opening of the balloon to your lips and exhale to the limit. Loop the end of the balloon and tightly tie the string or twine.
Then place the inflated balloon on the surface of the containers with water standing in the tub, gently press the top plate and begin to press for as long as the plate does not lie on the edges of the tank, and the bulb will not be submerged. Try to keep it not twisted (that is why the Board needs to be wide).
Of course, some of the water out, because it replaced the air enclosed in the volume of your ball. Now your task is to determine how much water is poured. (By the way, a similar problem was solved long ago, the great scientist Archimedes to determine whether pure gold made crown of king Hiero).
Remove pressure plate, remove the ball from partially empty containers. Then using the graduated cylinder, filling it and pouring the water into the tank, determine what volume of water will need to it again reached the edges. This volume is equal to the vitality of the lungs.
Advice 2: How to determine the volume of a cylinder
Cylinder as the geometric shape that may be parabolic, elliptic, hyperbolic. Even prism, by definition, is one of the private forms of the cylinder. However, in most cases under the cylinder mean shape at the base which are circles, and the angle between the side surface and the base is 90°. The following is the formula for calculating the volume of this cylinder.
If you know the base area of cylinder (S) and its height (H), then multiply the two known values to calculate the volume (V) of a cylinder: V=S∗H. for Example, if a footprint equal to two square meters and a height of four meters, the volume of the cylinder will be 2∗4=8 cubic meters.
If you know the radius of the circular base of the cylinder (R) and its height (H), then multiply the number PI (π) by the square of known length and radius to his height to calculate the volume (V) of the shape: V=π∗R2∗H. for Example, if the length of the radius of the base equal to fifty centimeters, and a height of four meters, the volume of the cylinder will be 3.14∗0.52∗4=3.14 cubic meters.
If you know the diameter of the circle at the base of the cylinder (D) and its height (H), the volume of the figure is equal to one quarter of the works in the PI (π) and the square of known length of the diameter of the circle: V=H∗π∗D2/4. For example, if the length of the diameter of the base equal to two meters and a height of four meters, the volume of the cylinder will be 4∗3.14∗22/4=12.57 cubic meters.
If you know the circumference of the base of the cylinder (L) and its height (H), then find the volume of cylinder (V), as the product of its height on the quotient of the square of the circumference by four PI (π): V=H∗L2/(4∗π). For example, if the circumference of base equal to two meters and a height of four meters, the volume of the cylinder will be 4∗22/(4∗3.14)=1.27 cubic meter.
Practical calculations when calculating the values of the volumes can be performed with the help of a calculator, and you can use the search engine Nigma or Google - it also built an easy to use computational algorithm. For example, to calculate the volume of the cylinder used in the previous step the original data in the search query box Google need to enter this text: "4 * 2^2 / (4 * PI)".