The Astonishing Heat Capacity of Snow: Explained

In summary, the amount of heat energy in an object is not solely determined by its temperature. A larger mass of a substance at a lower temperature can contain more heat energy than a smaller amount of the same substance at a higher temperature. This is because temperature is a measure of the average thermal energy per molecule, and not the total thermal energy of the object. To compare the heat energy of the 30,000 kg of snow at 0 deg C and 1 mL of liquid water at 100 deg C, one must use a phase diagram and consider the heat of fusion for each substance.
  • #1
bandrews789
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Explain how it is possible for a 30,000 kg of snow at 0 deg C to contain more heat energy than 1 mL of liquid water at 100 deg C. (Assume a pressure of one atmosphere.) I am unsure of where to start this? Help Is there a formula?
 
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  • #2
This is more of a conceptual thing: temperature is not thermal energy. Anything that is above absolute zero (zero Kelvins = -273 celcius) has thermal energy. Temperature is a measure of the average thermal energy per molecule in an object.

THink this way: what has more energy, a small cup of water at 100 C or a large barrel of water at 100 C? To put it another way, which one, the cup or barrel, needs more energy to get the water from 50 C to 100 C?
 
  • #3
Explain how it is possible for a 30,000 kg of snow at 0 deg C to contain more heat energy than 1 mL of liquid water at 100 deg C. (Assume a pressure of one atmosphere.) I am unsure of where to start this? Help Is there a formula?

apply a phase diagram (and assume that heat capacity of the constituents of snow is somewhat identical to that of H20), apply the heat of fusion value to completely "freeze" the snow to find the heat energy of the process...bring the 1mL of water at 100C to the same state; find the corresponding heat energy (100C, apply dq=mcdT, bring it to 0C and apply the heat of fusion value).
 
  • #4
Thank you for your assistance in this matter
 

Related to The Astonishing Heat Capacity of Snow: Explained

1. What is heat capacity?

Heat capacity is the amount of energy required to raise the temperature of a substance by one degree Celsius.

2. How does snow have a higher heat capacity than other materials?

Snow has a higher heat capacity due to its unique molecular structure. The hydrogen bonds between water molecules in snow allow it to absorb more heat energy before its temperature increases.

3. Why is it important to understand the heat capacity of snow?

Understanding the heat capacity of snow is important for various reasons. It helps us understand the behavior of snow in different environments, such as how it melts and how it affects the climate. It also has practical applications, such as in building insulation and avalanche prevention.

4. How does the heat capacity of snow affect its melting rate?

The high heat capacity of snow means that it requires more energy to melt compared to other materials. This is why snow can maintain its low temperature for longer periods, even in warmer environments. As a result, the melting rate of snow is slower compared to other substances.

5. Can the heat capacity of snow change?

Yes, the heat capacity of snow can change depending on various factors such as the density, temperature, and moisture content of the snow. As snow compacts and becomes denser, its heat capacity decreases. On the other hand, wet snow has a lower heat capacity compared to dry snow.

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