As you have noticed in the previous articles, where our main purpose has been to show some effects of atmospheric pressure around us, and also, with simple and practical examples that each of you can easily do at home.
All of us are constantly witnessing the great advances in the scientific-technological area and with this knowledge we have managed to develop useful tools such as barometers, however, in this opportunity my dear readers we will make a barometer type instrument with easily accessible materials in our homes, and this, in order to continue to understand some effects of atmospheric pressure in our existence.
Perhaps on many occasions you have heard that we are immersed in a sea of air, something totally true, as expressed by the great Italian physicist Evangelista Torricelli, and this we have been checking in previous installments.
Every instrument elaborated by man has an essential purpose in the analysis of certain phenomenon as is the case of barometers with atmospheric pressure, that is why this pressure is also called barometric, referring to the instrument that allows us to measure this pressure in any place where we are, therefore, it is very important to express that the first barometer was created by the above mentioned Evangelista Torricelli.
This time we will be able to make a simple barometer from our homes which will allow us to easily observe the effect of atmospheric pressure around us, so I invite you to observe the following elaboration of this instrument, where we will implement materials such as.
*Straw or straw for drawing soft drink.
*Hot and cold water.
Development of a barometer
As we have expressed my dear readers, these instruments (barometers) are used to measure the air pressure, that is, the pressure of the atmosphere, therefore, I invite you to visualize the following images that show the elaboration of our barometer.
In each of the previous images you could see the creation of our small barometer, and the same, we introduce it into a larger container in order to visualize the action of the magnitude of the pressure.
Logically, there is air inside the barometer, as well as outside it, therefore, when we put pressure with one of our hands to the piece of balloon placed on the mouth of the container of greater volume we are causing pressure to the other piece of balloon placed in our small barometer, and this action causes the membrane to sink due to the pressure exerted by my hand on that column of air between the two membranes.
Therefore, the pressure exerted by my hand on the column of air above our small barometer is greater than the pressure inside it, and that is why the membrane sinks, and thus the straw on the membrane is lifted from one side, indicating that the pressure exerted on the barometer is greater than the pressure inside it.
Now my dear readers, what would happen if instead of applying pressure with one of our hands, we now generate other conditions with temperature change to see how the pressure behaves inside our small barometer, this can be seen in the following images.
When we implement cold water we clearly notice how the pressure inside our small barometer decreases, and with it, the pressure outside is higher, thus causing the sinking observed in the previous images.
As for the example with hot water, of course, the opposite occurred, i.e., the pressure inside our small barometer increased, which caused the membrane to expand or swell, indicating that the pressure outside the barometer is lower.
All of us at some point in our lives have implemented any type of instrument created by our ingenuity through science-technology and this for the realization of a certain task, such as barometers which allow us to know the pressure exerted by the air in any space-time around us.
It is also important to note that we can apply science in our homes, and also, with simple materials easily accessible in our homes as you could see with the realization of a small barometer which still allows us to demonstrate the action of atmospheric pressure in our environment.
Until another opportunity my dear readers of @Hive.blog, especially the members of the great community of #stemsocial, for which I highly recommend being part of this beautiful project, because it allows us to highlight the excellent work of academia and likewise the excellent work of the entire scientific field.
Note: All images are my own and were captured with the camera of the Samsung Galaxy J2 Pro cell phone and edited in Power Point, the animated gif was made with the PhotoScape application.
Bibliographic references consulted and recommended