| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| February 4 is the natl. day to create one of these empty spaces, defined as having lower than atmospheric pressure | a vacuum | $400 | DJ | PHYSICS | 2023-07-26 | #8923 | |
| It's impossible to create a perfect one of these, a volume of space with no matter in it | Vacuum | $200 | DJ | PHYSICS | 1997-12-08 | #3056 |