# A query 'bout Chemistry...regarding Temperature.?

Hmmm.I wonder how and why:

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"2 substances may have the same
degree of measurement but they
differ in the amount of heat."

Explain and Give example...

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My chemistry teacher gave me that assignment which I shamefully don't understand, what she actually meant with that, but she want me to RESEARCH 'bout it.she was saying stuffs 'bout high and low places...and blah blah...

Can anyone tell me 'bout that? or like just tell what they think of "TEMPERATURE" in Chemistry.

THANK you :D

The formula for heat: Heat= mass X specific heat X change in temperature.

You will note that the formula for heat involves the amount of material(mass) as well as the specific heat of the material.

Temperature is defined as" how much the molecules are moving " or the average kinetic energy of the molecules.

2 substances can be at the same temperature but have different amounts of heat because there are different amounts of them, and they have different specific heats.
Temperature is defined as a measurement that compares how warm something is compared to another thing.

Heat is energy. Temperature is not a meassure of energy heat, but it is related.

Energy is also related to mass.

So if you were to have a teaspoon of water, and a bucket of water. Both could be at the same temperature, but the bucket of water would have more heat energy because there is more of it.
THink of fire.

You burn a few logs in your fireplace and the logs burn at a certain temperature and they give off a certain amount of heat. But a bonfire, the logs will burn at the same temperature, but they give off a LOT more heat - you can't stand near a bonfire.

Or this: you boil 3 gallons of water. You take a teaspoon of that water out and throw it on yourself. Water boils at 100oC, how bad is it going to be? What if you threw the remaining amount on yourself - it's the same temperature but there is a lot more damage/heat that is involved.

Temperature is a measurement of the kinetic energy of a substance. Heat is energy. The temperature of two things can bee the same, but one can be a lot more damaging in terms of it's heat!
Hi,

I think the question refers to conductivity.

Certain metals can dissipate heat faster than others so the amount of heat energy needed to heat the two different metals to the same temperature can be different.

It is like two saucepans, one cast iron the other copper.

If you apply heat to the center of the bottom of the pans the cast iron one will get hot in the middle then the heat will slowly spread. Whereas the copper one will conduct the heat away from the center and disperse it round the pan very quickly.

To get the both pans up to the same temperature will require different amounts of heat energy.

Hence the question:-

"Two substances may have the same
degree of measurement..referring to the temperature,
but they differ in the amount of heat".referring to the heat energy required to achieve the temperature.

Hope that explains it for you

Skip
When heat energy is added to a substance its Temperature will generally increase and, if heat energy is removed, the Temperature will generally decrease.
However, let us use our old favourite, 'Water'.
At a temperature of 0°C (32°F), or above, the addition of heat will increase the temperature of the water but, to no higher then 100°C (212°F). (Its boiling point).
Cooling, (removal of heat) from water at 100°C (212°F), will decrease its temperature but, to no lower than 0°C (32°F). (Its freezing point).
This is called 'the addition or removal of 'Sensible Heat'..because it can be sensed, or felt and, it can be measured with a thermometer.

We can now say that, for ANY substance between its freezing and boiling points, the addition or removal of sensible heat will increase or decrease its temperature.
Sensible heat (SpecificHeat), is different for different substances and will ONLY CHANGE the Temperature ..No change of state.

Another form of heat energy that affects substances is 'Latent Heat'. (or 'Hidden' heat). (Cannot be felt, sensed or measured with a thermometer).
This is heat added to or removed from a substance in order to Change its State (or Phase), from Solid to Liquid, (Addition of Latent Heat of Fusion or Melting), or from Liquid to Vapour (gas), (Addition of Latent Heat of Vaporisation).
In reverse, Removal of Latent heat of Condensation or Liquefaction, (From Vapour (gas) to Liquid, and Removal of Latent Heat of Freezing or Solidification, (Liquid to Solid)..
When Latent heat is being used, there is NO CHANGE in Temperature. The heat all goes into changing the molecular force of attraction in order to change the State (or Phase) of the substance. (Latent Heats are also different for different substances).

And, if you have two substances at the same temperature but contain different amounts of heat, it's because they have a different mass.
e.g. Again, Water. There are 2 containers of water both heated from 20°C to 60°C.
1 container holds 10 grams (or 10 pounds) and the other has 20 grams (or 20 pounds), the 2nd container, although at the same temperature, has had TWICE the amount of heat added in order to have the same temperature as the smaller amount.

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