Physical science questions
- Difference between evaporation and boiling
Evaporation is the process where a liquid turn into vapor while boiling is quick vaporization of any liquid entirely if it is heated to its boiling point. The boiling of a liquid depends on the temperature of the source of heat, while evaporation occurs at any temperature and only at the liquid’s surface.
- What is heat of fusion and heat of vaporization?
The amount of heat needed to melt one gram of any solid to liquid without changing the temperatures is heat of fusion.
Heat vaporization is the amount of energy needed to vaporize the one gram of liquid with temperature change at its boiling point.
- How does a heat engine work?
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This system changes heat energy to mechanical energy. The heat source heats the gas which expands, cools, and thrust out a piston. The piston is forced back into the cylinder compressing and heating the gas again just as the cycle started at the same pressure, volume, and temperature. The continuous process leads to rotations resulting to movements (Dawkins et., al. 2015)
- Is a refrigeration operation opposite to heat engine?
The difference is not quite big. The refrigerator keeps the temperatures of a substance lower than the surrounding temperature while the heat engine will keep the substance’s temperature higher than that of the surrounding. They all get heat from a reservoir of low temperature, taking it to a high-temperature reservoir.
- What is Thermodynamics and state its first law?
It is a branch of physical science that deals with heat energy and its relation to other energies.
The first law states that energy cannot be made or demolished, but it can be transformed or transferred to other forms.
- Newton’s law of attraction.
it states that force of attraction between two objects is directly proportional to the product of the masses and inversely proportional to the square distance between them.
F = G(m1m2)/R2
- Difference between mass and weight.
Mass is the quantity of matter in a body. It is measured in gm, kg. While weight is the amount of force applied by gravity on an object. It is measured in mg.
References
Roßnagel, J., Dawkins, S. T., Tolazzi, K. N., Abah, O., Lutz, E., Schmidt-Kaler, F., & Singer, K. (2015). A single-atom heat engine. Science, 352(6283), 325-329.