Solid to Gas
Some time ago, I was taking a ground school class for private pilots. During the sessions on weather, the instructor wanted to discuss the concept of sublimation - the act of going from a gas to a solid skipping the intermediate stage(s). e.g., frost - water vapor in the air becoming a solid on surfaces without first going through the liquid stage.
Wanting to see if the class had understood the concept, the instructor asked if anyone could provide an example of something that went straight from a solid to a gas (expecting "dry ice" as the answer).
A previously unknown section of my mind took control of my mouth and immediately emitted the word "burrito."
It took the instructor about 10 minutes to regain an academic composure.
"I have a sore throat, Doctor. I ache, I have a fever."
"Sounds like a virus."
"Everyone in the office has it."
"Well then, maybe it's a staff infection."
In his book, Sled Driver, SR-71 Blackbird pilot Brian Shul writes:
I'll always remember a certain radio exchange that occurred one day as Walt (my back-seater) and I were screaming across Southern California 13 miles high. We were monitoring various radio transmissions from other aircraft as we entered Los Angeles airspace. Though they didn't really control us, they did monitor our movement across their scope. I heard a Cessna ask for a readout of its ground speed.
"90 knots" Center replied. Moments later, a Twin Beech required the same.
"120 knots," Center answered. We weren't the only ones proud of our ground speed that day as almost instantly an F-18 smugly transmitted, "Ah, Center, Dusty 52 requests ground speed readout."
There was a slight pause, then the response, "525 knots on the ground, Dusty."
Another silent pause. As I was thinking to myself how ripe a situation this was, I heard a familiar click of a radio transmission coming from my back-seater. It was at that precise moment I realized Walt and I had become a real crew, for we were both thinking in unison.
"Center, Aspen 20, you got a ground speed readout for us?"
There was a longer than normal pause... "Aspen, I show 1,742 knots."
No further inquiries were heard on that frequency…
In another famous SR-71 story, Los Angeles Center reported receiving a request for clearance to FL 60 (60,000ft). The incredulous controller, with some disdain in his voice, asked, "How do you plan to get up to 60,000 feet?"
The pilot (obviously a sled driver), responded, "We don't plan to go up to it, we plan to go down to it." He was cleared.