Same volume, as well as same particle size :)

......Piccalilli Pie: So How Much Does an Aphid Weigh, Anyway? - According to an article published in New Scientist on August 9, 1979, one aphid, over the course of its life, weighs about 0.2 milligrams. New Scientist was, perhaps still is, first a news magazine, science just happens to be its main subject. And, what does '' over the course of its life,'' supposedly mean.

The OP's house has some small traditional features and it has a gable roof but its definitely not a Cape. A Cape always has a roof steep enough for a second story under the rafters with windows only in the gable ends. The entrance is always under the roof eave; a full cape has 2 windows each side of the door, a 3/4 cape has one on one side and two on the other, a half cape has a window each side of the door. You can drive for a mile through E. Oleans, MA and see very few houses that are not true capes. One story elements are sometimes added to the sides but rarely porches or dormers. Only a realtor would call the OP's house a cape. A Field Guide to American Houses classifies the OP's house as "Minimal Traditional" which is part of a larger category: "Modern" houses.

Of course you can check! But don't be tempted to peek before twenty or more days. If you are using a heat mat to provide bottom heat, the seeds will germinate much more quickly. Verbena seeds can take forever to germinate, weeks and weeks. I've actually never seen a black plastic recommendation before. Usually, a covering of fluffy germination mix is all that is required for seeds that require darkness and that's all I've ever done as a professional or a retired hobbyist. I'd think that covering with black plastic would encourage mold and mildew and set the seedlings up for rampant damping off diseases after germination. Anyway, I'm not going to confuse you by telling you how I would do it, but just ease your mind about checking for germination. Be very careful that the medium is not overly moist when you cover it or your project will not be successful.