How much is an Isaron of fine flour?
Rashi: It is one tenth of an Eifah
1 Eifah = 3 Sa'ah. 1 Sa'ah = 6 Kabin. 1 Kav = 4 Lugin. 1 Lug = 6 egg-volumes. 1 Eifah = 432 egg-volumes.
Seeing as the oil for the Menachos did not need to be "Kasis", why does the Torah write here "Kasis"?
Rashi: Even though the oil for the Menachos did not need to be "Kasis" 1 , the Torah writes "Kasis" here to teach us that Kasis is not Pasul.
What exactly was the Nesech?
Rashi: The Nesech was the three Lugin of wine that was brought together with the Korban Tamid, which was poured into one of the two silver bowls that were placed beside the south-western Keren of the Mizbe'ach, from where it poured on to the ground. 1
In the desert and down to the foundation in the Beis-ha'Mikdash (Rashi).