Jeff Stahler for October 03, 2021

Boyle’s law says that hot gas tries to occupy more volume… or the pressure increases. In the summer, you probably let out some air to keep the pressure right. Now it’s cooler and that amount of air makes less pressure.

I fill mine with nitrogen, It helps negate seasonal changes.

That light is perpetually glowing in the dash. Tires always check to best pressure, so that means sensor gone. Not helpful, especially considering the cost of finding which one is out.

LOL, one of my vehicles does the same.

I fixed my TPMS system with a small piece of black tape on the dashboard. A hell of a lot cheaper then spending $97 for a new sensor for one of the tires. And yes, I check my tire pressure manually with an accurate gauge once a week, and have for years.

I used to have a bicycle pump to do “emergency refills.” The pump broke, so I went to by a new one. I could get a manual pump for $35 or buy a mini-air compressor for $40. New refills are not an emergency and I don’t have to drive all over the place to find a working air compressor that will charge me $1.25.

Whenever one of my newer cars shows the low pressure light, I also check the air in the tires on my 1992 Dodge Dakota truck.

Normally, I just hop in the car and go. There are two things I check before a cross country trip: the oil and the tire pressure. Pretty much anything else is (a) either unlikely to happen or (b) I can deal with it on the spot or © I can ignore it until I get home.

It is possible to eliminate or reset the tire pressure software, I did it with my Ford, but it involves changing computer code (I like 26 psi).

Being ‘older than dirt’ I remember smelling the smoke coming from burning firewood to take the chill off on a Fall morning and burning a pile of raked leaves. Now I hear and smell the gas powered leaf blowers used to clog up the drains in the street. Back in the days before idiot lights in cars. But we still have idiots.

the rising cost of diesel due to competition with heating oil…

The gas laws were developed towards the end of the 18th century by numerous scientists (after whom, the individual laws are named). The five gas laws are:

Boyle’s Law, which provides a relationship between the pressure and the volume of a gas.Charles’s Law, which provides a relationship between the volume occupied by a gas and the absolute temperature.Gay-Lussac’s Law, which provides a relationship between the pressure exerted by a gas on the walls of its container and the absolute temperature associated with the gas.Avogadro’s Law, which provides a relationship between the volume occupied by a gas and the amount of gaseous substance.The Combined Gas Law (or the Ideal Gas Law), which can be obtained by combining the four laws listed above.

Under standard conditions, all gasses exhibit similar behaviour. The variations in their behaviours arise when the physical parameters associated with the gas (such as temperature, pressure, and volume) are altered. The gas laws basically describe the behaviour of gases and have been named after the scientists who discovered them.

https://byjus.com/jee/gas-laws/

This is ourselves under pressure

Sometimes a full size spare tire has a pressure sensor. Low pressure tire light drove my son-in-law and the tire store crazy until I said check the pressure in the spare …… Problem solved.

While traveling through Utah’s National Parks it gets Cold in the mornings. We had Tire pressure lights on every day. I guess 20f @ 5,000ft will mess with them. Our PSI Sensor is in the Value Stem Cap people keep stealing them.

So, I’m not the only person who noticed that happens every year as the weather cools down from Summer temperatures.

I check the tire pressure monthly. 35psi for the truck’s tires. A good air pump the plugs in the “cigarette lighter” and a digital tire gauge will run you maybe $30 and last you several years. When the TPMS goes on, I know there’s a problem.

Damned dashboard on the truck could launch the danged space shuttle though, has built in digital pressure readings on the menu scroll. Like a full launch sequence.

“And the cute little Jack O’Lantern…squirrel!!”

Soon our winters will be as hot as our summers, and poor Jeff will no longer be seasonally annoyed.

Got a few of them the past cool or cold nights or days.

The first time that light came on in my car, I had to look it up in the owner’s manual.

So much for symbols that are “Obvious” to the most casual observer.