In relation to the above we can say that this increase in the speed of sound is because its molecules oscillate faster, therefore, as the sound is caused by a vibration this makes the sound is transmitted with greater speed, taking into account that this analysis is in relation to the air, therefore, when there is sun the lower layers or closer to the earth's crust allow sound waves to travel faster because of its high temperature. The refraction of sound as we have expressed can occur in the same material or elastic medium, for example, air, and this happens when the properties of the medium are not equal, for example, we could easily express that the air temperature when it is sunny is not the same as at night, therefore, the layers of air that is close to the earth's crust are at higher temperature than those layers above these, then, the speed of sound waves increase with increasing temperature. This type of phenomenon allows us to highlight the change of direction of certain sound waves when they pass from one place to another, and this aspect is due to the fact that the speed of these sound waves changes due to the non-homogeneity of the obstacles or material media crossed by the sound. It is very important to highlight that sound can also be refracted by a single material medium, but at different conditions of temperature, density, elasticity, pressure, among other conditions related to the non-homogeneous material medium through which the sound will propagate. When we introduce ourselves to the refraction of sound we could say that this phenomenon constitutes a change of direction of these waves when passing or crossing a certain material medium or obstacle, this characteristic is also found in another essential phenomenon such as light, then my dear readers, just like light, sound when passing through different material media its speed will be affected bringing as a consequence a change of directionality of the sound waves. So far we have been able to notice that sound waves when propagating from an emitting source to a receiver get in their way with any kind of obstacles and these make these rays or sound waves undergo changes generating intrinsic phenomena such as reflection, absorption, transmission, diffraction and now refraction. The purpose of this article is to continue expanding the knowledge or learning about the essential phenomenon of sound, and as we know it travels or propagates from one space-time to another and this is done through a certain material or elastic medium such as air (gas), liquid or solid, in general, the sound to reach our auditory systems uses the air.
![sound reflection refraction diffraction sound reflection refraction diffraction](https://study.com/cimages/videopreview/b4266jqkql.jpg)
![sound reflection refraction diffraction sound reflection refraction diffraction](https://i.pinimg.com/originals/c9/cc/11/c9cc1154bcb8b678a1fbc29d64b6eac6.jpg)
First of all my respectful greetings to all the academic community of we continue to expand our knowledge related to the wonderful phenomenon of sound and this time we will relate in a general way with the refraction of sound waves.