why are map projections necessary
Why Are Map Projections Necessary? A map projection is ...
Though usually not a problem, thermal expansion can lead to high water pressure and cause expensive problems. The main reason to have an expansion tank in a domestic water system is to prevent the damage from high water pressure, defined as anything over 80 psi.
We’ve all been taught that water freezes at 32 degrees Fahrenheit, 0 degrees Celsius, 273.15 Kelvin. That’s not always the case, though. Scientists have found liquid water as cold as -40 degrees F in clouds and even cooled water down to -42 degrees F in the lab.Nov 30, 2011
Answer: When water solidifies to ice, then heat is evolved. Freezing is the transformation of a liquid into a solid as a result of a drop in temperature. Water turns into ice as the temperature drops, in other terms, water freezes into ice as the temperature drops, releasing heat in the process.
UCSB Science Line. Evidently when water turns from a liquid to a gas its volume increases 1600 times. This is was causes steam engines to work.
A substance that has a larger surface area will evaporate faster, as there are more surface molecules per unit of volume that are potentially able to escape. the higher the temperature of the substance the greater the kinetic energy of the molecules at its surface and therefore the faster the rate of their evaporation.
It is well known today that water has its maximum density at a temperature of about 14°C or 39°F.
That is, water has a high heat of vaporization, the amount of energy needed to change one gram of a liquid substance to a gas at constant temperature. Water’s heat of vaporization is around 540 cal/g at 100 °C, water’s boiling point.
Gases expand spontaneously to fill any container (rapid motion). Brownian motion of smoke particles (rapid motion). In an insulated container gases do not slow down and eventually condense (elastic collisions). The gas molecule do not interact with each other except for colliding with each other.
The steam is no hotter than the water but it contains more usable heat energy per gram, and it can release that heat as it encounters a cooler medium and makes the phase-change back to water.
It expands because the bonds holding water molecules to each other are broken in the transition from water to steam, and the steam behaves like a gas — it takes up much more space. If you put the water in a strong box and heat it up, it will not expand because the box keeps it from doing so.
What does heat do to metal? The expansion (or contraction) of any material is due to the kinetic energy of its atoms. When a material is heated, the increase in energy causes the atoms and molecules to move more and to take up more space— that is, to expand. This is true of even a solid such as a metal.
When you produce heat that raises internal temperature, your heart rate increases and vessels expand to bring more blood to the outer layers of skin, where the heat is released.