The Surprising Science Behind Something Your Hands Experience Every Day

Touch a metal spoon and a wooden spoon that have been in the same room.

The metal will feel cold.

The wood will feel warmer.

However, here is the surprising thing: They may actually be at almost exactly the same temperature!

What causes your hand to sense that metal is colder?

The explanation has nothing to do with the actual temperature.

Actually, it is all about the quickness of the transfer of heat.

🔥 TEMPURATURE IS NOT WHAT IS MAKING YOU FEEL COLD

Temperature is a measurement of how hot or cold an object is

When you touch something your skin is not actually measuring the actual temperature. Your nerves are picking up on how quickly the heat is transferring away from your skin. If your skin is warmer than your hand it will begin to loose heat to the object it is touching. the quicker the heat is being transferred away from your body, the colder the object will feel. Let's put this into perspective by looking at our first example: the metal and wooden spoon.

⚙️ METAL IS VERY GOOD AT MOVING HEAT

Most metals are very good at transferring heat. This means that when you put your warm hand on them heat will flow from the hottest object (your hand) to the coldest (the metal). The metal conducts the heat away from your hand and your body reacts by thinking "Hey, that is really cold!"

Wood is not a very good conductor. It does a poor job of conducting heat away from your hand and will not make you feel as cold. That is why when you touch the two spoons: metal feels colder and wood feels warmer. Even though they have been in the same room for a while, they are not actually at the same temperature.

🪵 TRY THIS SIMPLE EXPERIMENT

Look around your house for a metal object and a wooden object that have been in the same room for several hours. Give them a touch with your hand and you are sure to find that the metal does in fact feel colder. Try taking a thermometer and taking the temperature of both objects. You may just find that the temperature is almost the exact same. Your hand told you the rate of heat transfer, not simply the temperature. You may find this concept to be very useful in daily life. Here are some things that are true due to the principle being discussed:

🏠 THIS HAPPENS AROUND YOU EVERYDAY

A tile floor feels colder then a carpet

a metal chair feels colder than a wooden chair

a metal door handle can be quite "cold" in the winter

All of these are objects that will generally be at the same room temperature. Carpet and wood tend to be poor conductors of heat and metal tends to be a good conductor. This same concept is used when creating machines, cooking food, creating clothing, creating circuit boards, and creating insulation. You will see that something that conducts heat very well can be very useful. (Think about cooking pans.) On the flip side, something that does not conduct heat very well can be quite useful as well. The principle shown in this experiment is used around the world every day!

🔥 BUT THERE IS ALWAYS A FLIP SIDE

The flip side of this concept is that even though metal feels cold to the touch it is useful in moving heat in cases where we want it to move.

The same can be said for non-conductors. They prevent heat from moving, which is quite useful in some applications.

🧠 YOUR SENSES ARE GIVING YOU INFORMATION BUT THERE IS STILL CONTEXT TO BE TAKEN

This experiment shows you that your senses are very valuable, but there is still context to the situation. When you sense that a piece of metal is colder than a piece of wood it is because there is actually a physical difference in the two. The metal conducts heat much better. It is not necessary that it has a lower temperature, it just moves the heat away from your hand quicker. This is an interesting situation that shows you that while your hands (or any of your senses) can give you vital information, it is important not to jump to conclusions. That is why we have science! We have to understand things before we can conclude what is really going on.

🌍 AN ETHICAL REFLECTION

There is a very valuable lesson in this little experiment. Something you may not have thought about before. A first impression can be good enough to make a decision on. However, it is a valuable skill to be able to think deeper and ask the question "What else could be going on?"

I hope this experiment inspires you to think more deeply and question the world around you.

❓ QUICK QUESTIONS

Why does metal feel colder than wood?

Metal usually conducts heat away from your skin quicker.

Are the metal and wood necessarily different temperatures?

No. They could be almost the same.

Does wood actually produce heat?

No. It simply transfers heat away from your hand slower.

Why does a carpet feel warmer than a tile floor?

It conducts heat away from your feet slower.

📌 KEY TAKEAWAYS

• Feeling colder does not always mean having a lower temperature.

• Heat moves from warmer objects towards cooler ones.

• Metals generally conduct heat efficiently.

• Wood and many insulating materials transfer heat more slowly.

• Your skin senses heat transfer, while a thermometer measures temperature.

• Everyday experiences can reveal surprisingly deep scientific principles.

CONCLUSION

The next time you go to grab a metal object and you think to yourself "Hey, that feels colder than the wood." take a second and think about this experiment. That metal may not actually be colder.

Your hands tell you the difference between when you are touching a conductor vs. when you are touching a non-conductor of heat. That quick difference between feeling and science is the reason why science is so beautiful!

🌟 FEEDCOVER QUESTION

What other everyday experience have you noticed that seems simple-but might have a surprising scientific explanation?

SOURCE

OpenStax -- College Physics 2e, "Temperature"