Unrelated to the question, but what sort of degrees are you eating celery in? Celsius, where the celery is quite cold, Fahrenheit, where the celery is frozen solid (unlikely). I highly doubt one can eat celery at 7K.

Maybe the ambient temperature is 7 °C, 7 °F, 7 °Ré, 7 °Rø or 7 °N (7 K or 7 °Ra are unlikely) or they eat celery on a plane inclined by 7°.