An unknown material, m1 = 0.35 kg, at a temperature of T1 = 94 degrees C is added to a Dewer (an insulated container) which contains m2 = 1.4 kg of water at T2 = 21 degrees C. Water has a specific heat of cw = 4186 J/(kg⋅K). After the system comes to equilibrium the final temperature is T = 33.9 degrees C.   1. Input an expression for the specific heat of the unknown material.  2. What is the specific heat in J/(kg⋅K)?

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Q: A piece of unknown material has a mass of m, = 0.79 kg and an initial temperature of Ty = 76°C. The…

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A: a]

Q: (a) Compute the amount of heat (in J) needed to raise the temperature of 1.2 kg of water from its…

A: Recall Q=mc∆T and Q=mL for latent heat transfer.

Latent heat and phase change

A physical process in which a conversion among the basic states or phases of matter, i.e., solid, liquid, and gas takes place under the effect of a certain temperature and pressure is referred to as a phase change. Generally, the phase change of a substance occurs when heat transfer takes place between the substance and its surroundings. Based on the direction in which heat transfer takes place, different types of phase changes can occur.

Triple Point of Water

The branch of physics in which observer deals with temperature related properties is called thermodynamics.

Boiling Point of Water

Everyday examples of boiling is, boiling milk, heating water. One would have observed that when we heat water it goes through various stages and at one point bubbles show in water, and water keeps splashing with bubbles bursting, we in layman terms say that water is boiling.  

Freezing Point of Water

In general, the freezing point of water is 0° Celsius, or 32° Fahrenheit. This is the temperature at which water will ordinarily change from its liquid state to its solid state (ice). However, there are certain conditions that can affect the freezing point of water. For example, a liquid may be supercooled or contain impurities so that it does not freeze at the ordinary freezing point.