Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_43602 ( "Vacuum range" text, "Pressure in hPa (mbar)" text, "Molecules / cm 3" text, "Molecules / m 3" text, "Mean free path" text )

### Question ###
What is Mean Free Path, when Vacuum Range is 'medium vacuum'?

### Accurate SQL ###

SELECT "Mean free path" FROM table_43602 WHERE "Vacuum range" = 'medium vacuum'