Could I cook a steak with these?

These warmers are an exothermic chemical reaction, converting chemical energy to heat. If you put these in a perfectly insulated box, the temperature could rise above the "Max Temperature: 158 degrees Fahrenheit" because the energy would have no where to go. There are several unknowns such as the amount of energy stored in each hot hands pack, what size of steak you are cooking, and how much insulation a cooking chamber/container has. If you provide these parameters and calculate or create a test with an insulated container, you will have your answer.

Will the heat generated be too hot for a toddler?

DO NOT USE ON TODDLERS unsupervised! and seniors with thin more fragile skin. If you are thinking about using them for a age group with thin or tender skin like a toddler or senior, put them in a Pot Holder pouch, this reduces chances of burning, check often, if the skin turns pink, remove as the product needs more padding. It's to hot for that person with out more padding. Each of the different products they make rise to a different heat level. The large 18 hr one reaches up to 140 degrees, and can blister unprotected skin. I use the small hand ones, but I still put them in a Pot Holder pouch. Which in turn I pin in place over the area of my lumbar that hurts, and I can't get fixed. It's like having a 24 hr heating pad. If I didn't use the Hot Hands I would not be mobile, as it reduces the pain level. The smaller hand size do not get as hot as the larger ones. Not tried the ones for feet or that stick to your skin. As a senior, my skin is fragile, so I steer clear of anything that adheres to my skin. Hope my experience with Hot Hands has helped answer your questions. They are safe to use, read the directions though. Be aware of the fragility of the skin of the person who is using them. I can handle the small ones with out padding for a short while with my hands, but to put it on the more tender skin of my back, I use the Pot Holder to mute the heat to a lower level, which makes it just like low on a heating pad that you plug in. The key is the person's skin fragility, because even on low a plug in heating pad can burn a person. Which is why the newer ones have a 2 hr timer in them.If they are going into mittens, you could wrap them in some thing like a wash cloth to mute the amount of heat. Keep checking at area, if it is pink it is going into the burn phase.

Size	10 Count (Pack of 1)
Brand	HotHands
Color	Beige
Material	Blend
Recommended Uses For Product	Camping
Charging Time	10 Hours
Included Components	Instruction Manual, Storage Bag
Reusability	Single Use
Upper Temperature Rating	70 Degrees Celsius
Use for	Hand
Power Source	Disposable Air-Activated Warmers
Manufacturer	Heatmax
UPC	094733162593
Item Package Dimensions L x W x H	6.77 x 4.96 x 1.81 inches
Package Weight	0.4 Kilograms
Item Dimensions LxWxH	2.25 x 5.75 x 9.25 inches
Item Weight	1.9 Ounces
Brand Name	HotHands
Country of Origin	United States
Warranty Description	manufacturer
Model Name	Hothands
Suggested Users	Camping
Number of Items	1
Part Number	H162900
Model Year	2016
Style	Hand Warmer Value
Sport Type	Camping

HotHands Hand Warmer Value Pack, 10 Count (Pack of 1)

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