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Joined 2 years ago
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Cake day: June 11th, 2023

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  • Flip your refrigerator inside out. That is exactly what is happening.

    You need to understand the difference between “heat” and “temperature”.

    When you squeeze a gas inside a perfectly insulated container, no heat is transferred, but the temperature increases. If you allow the gas to expand again, it will return exactly to the temperature it started at. Again, no heat has transferred into or out of the gas, due to our (hypothetical) perfect insulation. The temperature has changed, but no heat has moved.

    In reality, we aren’t using a perfect insulator. When we compress the gas, the temperature of the gas rises. Heat starts flowing from the compressed gas to the container, and into the air. The gas is still compressed after the heat has left, but its temperature falls to ambient. This all happens inside the house.

    The cooled, compressed gas is now piped outside. It is expanded. Because it doesn’t have the same amount of heat that it started with, the temperature plummets. It gets extremely cold, far colder than the outside atmosphere. Heat from the atmosphere flows into the cold gas. The cold, decompressed gas then goes to a compressor, and the cycle repeats.







  • Scenario 1. You’re in the lane, about to park. I’m following you. You come to a stop in the lane. You have the right of way; I have to yield to you until you leave the lane. You could completely ignore me if you wanted to. You only need to observe and avoid obstacles near your vehicle.

    Scenario 2. You’re in the parking space, about to back into the lane of traffic. I am approaching in the lane. I have the right of way over the lane. In addition to maneuvering your vehicle around obstacles up close, you also have to observe and yield to me, approaching from a distance.





  • It takes advantage of right-of-way to avoid collision while backing.

    I’m following you. When you decide to back in to your parking space, you have the right-of-way over the lane until you have completely left it. I have to yield to you, even if you come to a complete stop in the lane of traffic. While your vision and attention is compromised due to backing, I am responsible for avoiding you.

    When you are attempting to back out of the parking spot and into my lane, you do not have right-of-way until you are fully established in the lane. Despite your vision and attention being compromised due to backing, you are also responsible for avoiding me. I don’t have to yield to you until you are completely within the lane.