Recent comments in /f/boston

dyqik t1_j6pgjcm wrote

I build cryostats and operate superconducting detectors - I've been handling liquid cryogens for over twenty years.

I've stuck my hand in liquid nitrogen hundreds of times.

The main danger from liquid cryogens is the displacement of oxygen from the area when it flash boils.

While small amounts of liquid will skate around on a vapor barrier (leidenfrost effect on solid surfaces), in volume, the boiling at the interface between water and the liquid will produce some amount of turbulence and mixing that increases heat transfer.

1

Large_Inspection_73 t1_j6pgdye wrote

How come none of you fantasy train weirdos ever consider where existing and former railroad tracks run for your proposals? Obviously any new subway or commuter rail lines would utilize those ROW before bulldozing existing communities or building tunnel at a cost of $3 billion per mile.

0

watermelonprincess12 t1_j6pfz5t wrote

Depends on when you’re on 93 and what direction, but yeah generally speaking the big exits and splits always suck. The 95/93 split in Woburn is almost always horrendous.

Also- can we talk about the drivers weaving in and out of traffic like lunatics late nights and sometimes mornings??? Are they drag racing? It’s insane

27

Hribunos t1_j6pfqs9 wrote

Have you ever seen LN2 skittering across a floor? It's like that. There wouldn't actually be that much heat transfer from the ocean- the LNG would skate across the surface on a thin layer of vapor.

I used to work in the seaport, and we ran the numbers - it's not enough to destroy building or whatever but anyone standing on the pier is gonna be a popsicle.

1

georgethethirteenth t1_j6pfltm wrote

Ugh, I understand the reason we don't get it but this was the number one reason I switched from CR to driving.

In my case, it wasn't so much frequency as the first train not being able to get me to the office in time for a daily 6:00AM. I'd grab the first train of the morning, hit Porter at 5:47 and have no shot at getting to my desk in Kendall by 6:00 (thank you multi-team collaboration and time zones).

Before I had this meeting hit my calendar on the daily I had taken the CR every morning/afternoon. It had the occasional issue, but I didn't find the fare overly excessive, it was less stressful than sitting in traffic, and I got my yearly book count to unprecedented levels - I actually enjoyed the CR.

Of course then there was Covid, a move, and a job change so I wouldn't use it anymore...but an improvement in both frequency and hours would have been most appreciated by me a few years ago.

3