# How much heat is needed to increase the temperature of #"1 kg"# of foam by #"2 K"# knowing that the specific heat of foam is #"1200 J kg"^(-1)"K"^(-1)# ?

##### 1 Answer

#### Explanation:

The **specific heat** of a substance tells you how much heat is needed in order to increase the temperature of *one unit of mass* of that substance, usually **or** by

In your case, the specific heat of foam is given as

Now, you must figure out how much heat is needed to increase the temperature of

In this case, you know that you need **another** **again**.

In other words, you will need

#2 color(red)(cancel(color(black)("K"))) * overbrace("1200 J"/(1color(red)(cancel(color(black)("K")))))^(color(blue)("needed for 1 kg of foam")) = color(darkgreen)(ul(color(black)("2400 J")))#

I'll leave the answer rounded to two **sig figs**.