hi and welcome to the section of the chemistry tutor and this section we're going to cover the very important topic of density and temperature or temperature and density of a material and also its basic definition what it means in everyday life and also what it means in terms of chemistry because as you know most of the challenge in doing well at chemistry and also of most courses is really getting the good understanding of the definitions once you get the bedrock noun then moving on into the more you know what people think the complicated material is more and more complicated material it gets easier and easier so here we're going to talk about temperature first temperature is something you have everyday experience with it's something that you kind of think you have an everyday association and understanding of and in fact probably you do what we're gonna do here is put some some real definitions into it so let me ask you this what do you think the concept of temperature is I mean we know that when we grab something quote-unquote hot has a higher temperature it burns our hands right we also know that if we go outside on a cold snowy day or go into the freezer and grab something that feels very cold and and an arctic and just chilly it has a lower temperature all right so both of those things actually in the extreme can burn you and hurt you and why do you think that is if you grab something let's say something's very hot and it burns you why do you think that that happens well in a basic sense temperature really is a measure of how much energy something has and physical object has the higher the temperature the higher the energy content we say the kinetic energy of motion of the of the atoms and the molecules inside of that material and so we say it has a higher temperature so when you watch your thermometer go up to you know 50 degrees 70 degrees 90 degrees or whatever what we're really saying is that that material with a higher temperature has had more has has more energy it means the molecules the atoms whatever is made up of that materials made of is literally vibrating more vigorously really is what it means so if you grab a hot object that energy that's in the object is transmitted to your hand and it ends up damaging your tissue because it's sending that energy of motion right into your hand and it kind of on a microscopic level kind of rips it apart a little bit that's why you get burned right so in a nutshell that's what temperature is higher temperature means more internal energy of something lower temperature means lower energy of motion of the atoms of the molecules so let's put that into words and let's we'll talk about temperature scales here also so the general concept of temperature if I had to give it a definition that I would write on the board it would be the measure of the internal energy