You might have noticed that if you are trying to boil a lot of water It takes longer than if you only wish to boil a small amount of water This is all because of something called heat capacity Keep watching to learn more Before we get into details it is important to realize that there is a difference between heat and temperature Temperature is a way of describing how hot or cold an object is and is measured in degrees Celsius Whereas heat is a form of energy and is measured in joules? The more heat transferred to an object the more its temperature will rise so heat and temperature are related, but they are not the same So what is heat capacity? The heat capacity of a substance is defined as the amount of heat required to raise the temperature of a material by one degree Celsius However, what’s more useful for us to think about is the specific heat capacity of the substance This is as it says in the name a little bit more specific It is the amount of heat required to raise one kilogram of a material by one degree Celsius different materials have different known specific heat capacities But we aren’t always given a table like this so we need to know how to calculate specific heat capacities ourselves We have this equation which can be written as symbols like this The energy transferred is the heat energy absorbed or released this equation can also be rearranged to Work out, the temperature change subtract the old temperature from a new temperature Let’s have a look at a problem Pause the video and attempt to calculate the specific heat capacity of lead How did you get on? The energy transferred is this The mass is this and the temperature change is 10 degrees Celsius because it’s this takeaway this Using the rearranged equation substitute in the values and we get a hundred and twenty-eight joules per kilogram Celsius Here is another practice problem pause the video and attempt to calculate the energy transferred to the LED Did you get it right? We could divide by 1000 to turn the answer into kilojoules Notice that the answer is negative this time It’s because we called the LED the temperature change will always be negative if it is being cooled and positive if it is being heated So there you have it to summarize Specific heat capacity is the amount of energy needed to raise one kilogram of a substance by one degree Celsius It’s helpful because it allows us to work out how much energy we need to heat up or cool down the substance to a desired temperature To calculate it use the following equation Please like and share our videos with your friends if you have any questions that you want help with just comment below

My science mocks start Tuesday, GREAT

good going

Is it ok, that we write "delta-temperature" instead of "o-crossed" fer the difference between temperatures in our school (Russia)? An' the answer is 128 J/kg*C calculated by myself… ok, that was in the vid already… sorry.

thx

Really well presented – best format.

Just THANKS 🙂

I love learning like this

Amazing!! Loved it

Thanks

This video is great it helped me do my homework

Devin is smart

0:29 Triggered Americans.

Nothing to do with rockets

Thanks for the video,i wish that you would be a teacher in my school. I find it easier to learn here thenn school