If you mean UL Rated, that is an abbreviation for an electrical product being approved by the Underwriters Laboratories as safe to use or have.
If you buy a space heater, for instance, that is not UL Rated and does not bear the stamp that it is UL Rated, I wouldn't recommend using it.
The UL ratio becomes 1:1 by the age of 10 years.
The answer depends on the ratio of a uL with what: a millilitre, a litre, etc.
1.6:1
The UL ratio, or upper-to-lower segment ratio, is typically around 0.85 by 10 years of age. This ratio measures the proportion of a person's body between the upper and lower limbs, and it helps assess body proportions and growth patterns.
Eid-ul-fitr and Eid-Ul-Adha Eid-ul-fitr and Eid-Ul-Adha
Ibtesam ul Haq and Hassam ul Haq
Shan-ul-Haq. His sons' names are Ibtesam-ul-Haq, (He is my class fellow) and Hassam-ul-Haq.
uL means microliter
UL = Upper Limit
ppm is a volumetric ratio so you need to know two things - the volume of the specific gas and the volume of the container it exists in. Assuming the gas you are interested in starts out at the conditions n the vial and the other gases act ideally simply compare the volumes. If the T and P are not the same convert using PV=nRT. In this case you start with 3000 ul in 12.5 ml. As 1 ml=1,000 ul, the ratio is determined from 3,000 ul in 12,500 ul Divide top and bottom by 12.5 . This is gas per thousand ul (3000/12.5)/(12,500/12.5) = 240/1000 Multiply top and bottom by 1000 to get results over a million: 240,000/1,000,000 The numerator 240,000 is ppm
The conversion is 1000 ul/ mL
UL = Upper Limit