how do we find out that how much hot or cold an object is?
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Measurement of heat is done in calories. One calorie is the amount of energy required to raise one gram of water one degree Celsius. To measure heat, you divide the change in temperature of a sample of water by the mass of the water.
The reason is that energy is always transferred from a body at higher temperature to a body at lower temperature and, as a result, there is no such thing as “cold” flowing from the ice to the drink.
The reason is that energy is always transferred from a body at higher temperature to a body at lower temperature and, as a result, there is no such thing as “cold” flowing from the ice to the drink.
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The concept of temperature arises from the zeroth law of thermodynamics:
If two systems are in thermodynamic equilibrium with a third system, the two original systems are in thermal equilibrium with each other. Basically, if system A is in thermal equilibrium with system C and system B is also in thermal equilibrium with system C, system A and system B are in thermal equilibrium with each other.
From here, many hypothetical scales for temperatures are stablished.
It's said than one body has higher temperature than another when there is a heat exchange from the former to the latter.
But hot and cold are just sensations or feelings defined by people. Something is called hot when it's at higher temperature than our body (~37 °C), so a positive heat exchange will take place on contact. The opposite for cold (heat transference from our body to the cold object).
So, you are right, the higher the temperature of an object, the hotter it will be, but the concept hot is just to define the thermal perception.
If two systems are in thermodynamic equilibrium with a third system, the two original systems are in thermal equilibrium with each other. Basically, if system A is in thermal equilibrium with system C and system B is also in thermal equilibrium with system C, system A and system B are in thermal equilibrium with each other.
From here, many hypothetical scales for temperatures are stablished.
It's said than one body has higher temperature than another when there is a heat exchange from the former to the latter.
But hot and cold are just sensations or feelings defined by people. Something is called hot when it's at higher temperature than our body (~37 °C), so a positive heat exchange will take place on contact. The opposite for cold (heat transference from our body to the cold object).
So, you are right, the higher the temperature of an object, the hotter it will be, but the concept hot is just to define the thermal perception.
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